noi.html

<script id="ch0101/01" type="1.1.1">
  console.log("hello,world")
</script>

<script id="ch0101/02" type="1.1.2">
  var x = +prompt("请输入整数",)
    var y = +prompt("请输入整数",)
    var z = +prompt("请输入整数",)
    console.log(y)
</script>

<script id="ch0101/04" type="1.1.4">
  var x = +prompt("请输入一个单精度浮点数",)
    var y = x.toFixed(3)

    console.log(y)
</script>

<script id="ch0101/05" type="1.1.5">
  var x = +prompt("请输入一个双精度浮点数",)
    var y = x.toFixed(12)

    console.log(y)
</script>

<script id="ch0101/06" type="1.1.6">
  var x = prompt("请输入一个字符",)
    var y = prompt("请输入一个整数",)
    var z = prompt("请输入一个单精度浮点数",)
    var w = prompt("请输入一个双精度浮点数",)

    console.log(x+" "+y+" "+z+" "+w)
</script>

<script id="ch0101/08" type="1.1.8">
  var p = prompt("请输入","*")
    console.log(
        " " + " " + p + " "+" " +"\n" +
        " "+ p + p +p  +" " +"\n" +
        p + p + p + p + p+"\n"
    )
</script>

<script id="ch0101/09" type="1.1.9">
  var p = prompt("请输入","*")
console.log(
" " + " " + p + " "+" " +"\n" +
" "+ p + p +p  +" " +"\n" +
p + p + p + p + p+"\n" +
" " + p + p + p +" " +"\n" +
" " + " " + p + " "+" " +"\n"
)
</script>

<script id="ch0103/01" type="1.3.1">
  var p = +prompt("请输入一个整数","")
    var q = +prompt("请输入一个整数","")
    var z = p + q

    console.log(z)
</script>

<script id="ch0103/02" type="1.3.2">
  var a = +prompt("请输入一个整数","")
    var b = +prompt("请输入一个整数","")
    var c = +prompt("请输入一个整数","")
    var w = (a + b) * c

    console.log(w)
</script>

<script id="ch0103/03" type="1.3.3">
  var a = +prompt("请输入一个整数","")
    var b = +prompt("请输入一个整数","")
    var c = +prompt("请输入一个整数","")
    var w = (a + b) / c
    console.log(parseInt(w))
</script>

<script id="ch0103/04" type="1.3.4">
  var p = +prompt("请输入一个整数","")
    var q = +prompt("请输入一个整数","")
    var s = p/q
    var x = s.toFixed(0)
    var t = p%q

    console.log(x + " " + t)
</script>

<script id="ch0103/05" type="1.3.5">
  var p = +prompt("请输入一个整数","")
    var q = +prompt("请输入一个整数","")
    var s = p/q
    var t = s.toFixed(9)

    console.log(t)
</script>

<script id="ch0103/06" type="1.3.6">
  var p = +prompt("请输入确诊数","")
    var q = +prompt("请输入死亡数","")
    var s = q/p
    var t = (s * 100).toFixed(3)

    console.log(t + "%")
</script>

<script id="ch0103/07" type="1.3.7">
  var x = +prompt("请输入一个整数","")
    var a = +prompt("请输入一个整数","")
    var b = +prompt("请输入一个整数","")
    var c = +prompt("请输入一个整数","")
    var d = +prompt("请输入一个整数","")
    var z = a*x*x*x+b*x*x+c*x+d
    var y = z.toFixed(7)

    console.log(y)
</script>

<script id="ch0103/08" type="1.3.8">
  var f = +prompt("请输入一个整数","")
    var e = 5*(f-32)/9
    var C = e.toFixed(5)

    console.log(C)
</script>

<script id="ch0103/09" type="1.3.9">
  var r = +prompt("请输入半径","")
    var a = 2 * r
    var d = a.toFixed(4)
    var b = 3.14159 * d
    var C = b.toFixed(4)
    var f = 3.14159 * r * r
    var S = f.toFixed(4)

    console.log(d+" "+C+" "+S)
</script>

<script id="ch0103/10" type="1.3.10">
  var r1 = +prompt("请输入电阻值","")
    var r2 = +prompt("请输入电阻值","")
    var a = 1/(1/r1+1/r2)
    var R = a.toFixed(2)

    console.log(R)
</script>

<script id="ch0103/11" type="1.3.11">
  var a = +prompt("请输入双精度浮点数","")
    var b = +prompt("请输入双精度浮点数","")
    var c =  a % b
    var d = c.toFixed(4)

    console.log(d)
</script>

<script id="ch0103/12" type="1.3.12">
  var r = +prompt("请输入半径","")
    var a = (4/3) * 3.14 * r * r * r
    var V = a.toFixed(2)

    console.log(V)
</script>

<script id="ch0103/13" type="1.3.13">
  var a = prompt("请输入","")
    var b = ""
    for (var i =a.length -1; i>= 0; i= i-1)
    {
        b=b+a[i]
    }

    console.log(b)
</script>

<script id="ch0103/14" type="1.3.14">
  var h = +prompt("请输入小圆桶的深","")
    var r = +prompt("请输入小圆桶的底面半径","")
    var v = 3.14159 * r * r * h
    var a = v/1000
    var y = Math.ceil(20/a)

    console.log(y)
</script>

<script id="ch0103/15" type="1.3.15">
  var n = +prompt("请输入苹果个数","")
    var x = +prompt("虫子 x 小时吃掉一个苹果","")
    var y = +prompt("经过 y 小时","")
    var a = n - y/x
    var b = Math.floor(a)

    console.log(b)
</script>

<script id="ch0103/16" type="1.3.16">
  var Xa = +prompt("请输入A点横轴坐标","")
    var Ya = +prompt("请输入A点纵轴坐标","")
    var Xb = +prompt("请输入B点横轴坐标","")
    var Yb = +prompt("请输入B点纵轴坐标","")
    var c = Math.sqrt((Xa-Xb)*(Xa-Xb)+(Ya-Yb)*(Ya-Yb))
    var y = c.toFixed(3)

    console.log(y)
</script>

<script id="ch0103/17" type="1.3.17">
  var Xa = +prompt("请输入A点横轴坐标","")
    var Ya = +prompt("请输入A点纵轴坐标","")
    var Xb = +prompt("请输入B点横轴坐标","")
    var Yb = +prompt("请输入B点纵轴坐标","")
    var Xc = +prompt("请输入C点横轴坐标","")
    var Yc = +prompt("请输入C点纵轴坐标","")
    var a = Math.sqrt((Xa-Xb)*(Xa-Xb)+(Ya-Yb)*(Ya-Yb))
    var b = Math.sqrt((Xa-Xc)*(Xa-Xc)+(Ya-Yc)*(Ya-Yc))
    var c = Math.sqrt((Xb-Xc)*(Xb-Xc)+(Yb-Yc)*(Yb-Yc))
    var p = ((a+b+c)/2)
    var e = Math.sqrt(p*(p-a)*(p-b)*(p-c))
    var S = e.toFixed(2)
    console.log(S)
</script>

<script id="ch0103/18" type="1.3.18">
  var a1 = +prompt("请输入a1","")
    var a2 = +prompt("请输入a2","")
    var n = + prompt("请输入n项","")
    var d =  a2-a1
    var an = a1 + (n-1)*d
    console.log(an)
</script>

<script id="ch0103/19" type="1.3.19">
  var A = +prompt("请输入A")
    var B = +prompt("请输入B")
    var C = A*B
    console.log(C)
</script>

<script id="ch0103/20" type="1.3.20">
  var n = +prompt("请输入n")
    var S = Math.pow(2, n);
    console.log(S)
</script>

<script id="ch0104/01" type="1.4.1">
  var N = +prompt("请输入一个整数")
    if (N>0){
        console.log("positive")
    }else if (N<0){
        console.log("negative")
    } else{
        console.log("zero")
    }
</script>

<script id="ch0104/02" type="1.4.2">
  var N = +prompt("请输入一个浮点数")
    console.log(Math.abs(N))
</script>

<script id="ch0104/03" type="1.4.3">
  var N = +prompt("请输入一个整数")

    if (N % 2 === 0){
        console.log("even")
    } else {
        console.log("odd")
    }
</script>

<script id="ch0104/04" type="1.4.4">
  var N = prompt("请输入一个字符")
    var n =N.charCodeAt()

    if (n % 2 == 0){
        console.log("NO")
    } else{
        console.log("YES");
    }
</script>

<script id="ch0104/05" type="1.4.5">
  var x = +prompt("请输入一个整数x")
    var y = +prompt("请输入一个整数y")

    if (x > y){
        console.log(">")
    } else if (x<y){
        console.log("<")
    } else {console.log("=")}
</script>

<script id="ch0104/06" type="1.4.6">
  var x = +prompt("请输入一个正整数")

    if (x>=10 && x<=99){
        console.log(1)
    }else {console.log(0)}
</script>

<script id="ch0104/07" type="1.4.7">
  var x = +prompt("请输入幸运瓶盖数")
    var y = +prompt("请输入鼓励瓶盖数")

    if (x>=10 || y>=20){
        console.log(1)
    }else {console.log(0)}
</script>

<script id="ch0104/08" type="1.4.8">
  var n = +prompt("请输入一个数")

    if (n%3==0 && n%5==0){
        console.log("YES")
    }else{
        console.log("NO")
    }
</script>

<script id="ch0104/09" type="1.4.9">
  var n = +prompt("请输入一个数")

    if (n%3==0 && n%5==0 &&n%7==0){
        console.log("3"+" "+"5"+" "+"7")
    }else if(n%3==0 && n%5==0 && n%7 != 0 ){
        console.log("3"+" "+"5")
    }else if (n%5==0 && n%7==0 && n%3 != 0){
        console.log("5 7")
    }else if (n%3==0 && n%7==0 && n%5 !=0){
        console.log("3 7")
    } else if (n%3==0 && n%5!=0 && n%7!=0){
        console.log("3")
    } else if (n%5==0 && n%3!=0 && n%7!=0){
        console.log("5")
    } else if (n%7==0 && n%3!=0 && n%5!=0){
        console.log("7")
    } else{
        console.log("n")
    }
</script>

<script id="ch0104/10" type="1.4.10">
  var x = +prompt("请输入语文成绩")
    var y = +prompt("请输入数学成绩")

    if ((x<60 && y>60)||(x>60 && y<60)){
        console.log("1")
    } else {
        console.log("0")
    }
</script>

<script id="ch0104/11" type="1.4.11">
  var x = +prompt("请输入星期几")

    if (x==2 || x ==4 || x ==6 || x==7){
        console.log("YES")
    }else {
        console.log("NO")
    }
</script>

<script id="ch0104/12" type="1.4.12">
  var x = +prompt("请输入距离")
    var b = (27 + 23) + x/3
    var c = x/1.2

    if (b<c){
        console.log("Bike")
    } else if (b>c){
        console.log("Walk")
    } else {
        console.log("All")
    }
</script>

<script id="ch0104/13" type="1.4.13">
  var N = +prompt("请输入一个浮点数")

    if (0<=N<5) {
        var y = -N+2.5
        c=y.toFixed(3)
        console.log(c)
    }else if (5<=N<10) {
        var y=2-1.5*(N-3)*(N-3)
        c=y.toFixed(3)
        console.log(c)
    }else if(10<=N<20){
        var y =N/2 -1.5
        c=y.toFixed(3)
        console.log(c)
    }
</script>

<script id="ch0104/14" type="1.4.14">
  var x = +prompt("请输入重量")
    var a = prompt("是否加急 y or n")

    var b = Math.ceil((x-1000)/500)*4
    var c = b +8
    var d = b +5 +8

    if (x<1000 && a==="n"){
        console.log("8")
    }else if (x>1000 && a==="n"){
        console.log(c)
    } else if (x>1000 && a==="y"){
        console .log(d)
    }
</script>

<script id="ch0104/15" type="1.4.15">
  var a = +prompt()
    var b = +prompt()
    var c = +prompt()

    var d = Math.max(a,b,c)

    console.log(d)
</script>

<script id="ch0104/16" type="1.4.16">
  var a = +prompt()
    var b = +prompt()
    var c = +prompt()

    if (a+b>c && a+c>b && b+c>a){
        console.log("yes")
    }else{console.log("no")}
</script>

<script id="ch0104/17" type="1.4.17">
  var a = +prompt()

    if(a % 400==0 || (a%4==0 && a%100!=0)){
        console.log("Y")
    }else{
        console.log("N")
    }
</script>

<script id="ch0104/18" type="1.4.18">
  var x = +prompt()
    var y = +prompt()

    if((x>=-1 && x<=1) && (y>=-1 && y<=1)){
        console.log("yes")
    }else{
        console.log("no")
    }
</script>

<script id="ch0104/19" type="1.4.19">
  var x = +prompt()
    var y = +prompt()
    var z = prompt()

    var a= x+y
    var b= x-y
    var c= x*y
    var d= x/y

    if(z=== "+"){
        console.log(a)
    }else if(z === "-"){
        console.log(b)
    }else if(z === "*"){
        console.log(c)
    }else if(z === "/"){
        if(y != 0){
            console.log(d)
        }else if(y === 0){
            console.log("Divided by zero")
        }
    } else{
        console.log("Invalid operator")
    }
</script>

<script id="ch0104/20" type="1.4.20">

  if(b*b==4*a*c){
    console.log('x1=x2=' + (-b/2*a))
}else if(b*b>4*a*c){
    var x1=(-b + Math.sqrt(b*b - 4*a*c))/2*a
    var x2=(-b - Math.sqrt(b*b - 4*a*c))/2*a
    console.log("x1="+x1,"x2="+x2)
}else if(b * b < 4 * a * c){
    var x1imag = (Math.sqrt(4 * a * c - b * b))/(2 * a) //此为 delta ,因为 delta < 0,所以4ac-b^2
    var x1real = -b/(2 * a)

    if (x1imag % 1 === 0){  //可判断是否为整数
        x1imag=x1imag
    }else{
        x1imag = x1imag.toFixed(5)
    }

    if(x1imag ===1){
        x1imag = "i"          // 引入 i

    }else if (x1imag === -1){
        x1imag = "-i"
    }else {
        x1imag = x1imag + "i"
    }

    var x1 = (x1real) + "+" + (x1imag)

    var x2imag = (Math.sqrt(4 * a * c - b * b))/(2 * a) //此为 delta
    var x2real = -b/(2 * a)

    if (x2imag % 1 ===0){
        x2imag=x2imag
    }else{
        x2imag = x2imag.toFixed(5)
    }

    if(x2imag ===1){
        x2imag = "i"
    }else if (x2imag === -1){
        x2imag = "-i"
    }else {
        x2imag = x2imag + "i"
    }

    x1real =x1real.toFixed(5)
    x2real =x2real.toFixed(5)

    var x1 = (x1real) + "+" + (x1imag)
    var x2 = (x2real) + "-" + (x2imag)
    console.log("x1 =" + x1 + ";" + "x2 =" + x2)
}
</script>

<script id="ch0104/21" type="1.4.21">
  var n = +prompt()
    var x = +prompt()
    var y = +prompt()

    var z = n - Math.ceil(y/x)

    if(n>=(y/x)){
        console.log(z)
    }
</script>

<script id="ch0105/01" type="1.5.1">
  var n = +prompt()
    var sum = 0

    for(i=0;i<n;i=i+1){
        var age = +prompt()
        sum = sum + age
    }

    var ave = (sum/n).toFixed(2)

    console.log(ave)
</script>

<script id="ch0105/02" type="1.5.2">
  var sum = 0

    for (var i = 0; i < 12; i = i + 1) {
        var sur = +prompt()
        sum = sum + sur
    }

    var ave = (sum / 12).toFixed(2)

    console.log("$" + ave)
</script>

<script id="ch0105/03" type="1.5.3">
  var n = +prompt()
    var sum = 0

    if (n < 100) {
        for (var i = 0; i < n; i = i + 1) {
            var c = +prompt()
            sum = sum + c
        }

        var ave = (sum / n).toFixed(4)

        console.log(ave)
    }
</script>

<script id="ch0105/04" type="1.5.4">
  var n = +prompt()
  var sum = 0

  for (var i = 0; i < n; i = i + 1) {
      var c = +prompt()
      sum = sum + c
  }

  var ave = (sum / n).toFixed(5)

  console.log(sum + " " + ave)
</script>

<script id="ch0105/05" type="1.5.5">
  var n = +prompt()
  var max = 0   //-Infinity适用 
  for (var i = 0; i < n; i = i + 1) {
      var c = +prompt() //循环一次一个值
      if (max < c) { //max 与 c 比较 若 max<c，则值c赋给max，否则不赋值，然后继续循环，循环完毕则max为最大值
          max = c
      }
  }
    console.log(max)
</script>

<script id="ch0105/06" type="1.5.6">
  var n = +prompt()
  var max = -Infinity
  var min = Infinity
  for (var i = 0; i < n; i = i + 1) {
      var c = +prompt()
      if (max < c) {
          max = c
      }
      if (min > c) {
          min = c
      }
      var b = max - min
  }
  console.log(b)
</script>

<script id="ch0105/07" type="1.5.7">
  var n = +prompt()
  var gold = []
  var silver = []
  var bronze = []
  var gold_sum = 0
  var silver_sum = 0
  var bronze_sum = 0

  for (var i = 0; i < n; i = i + 1) {
    gold[i] = +prompt()
    silver[i] = +prompt()
    bronze[i] = +prompt()

    gold_sum = gold[i] + gold_sum
    silver_sum = silver[i] + silver_sum
    bronze_sum = bronze[i] + bronze_sum
  }
  var sum = gold_sum + silver_sum + bronze_sum

  console.log(gold_sum, silver_sum, bronze_sum, sum)
</script>

<script id="ch0105/08" type="1.5.8">
  var n = +prompt()
  var angle_ps = 0

  for (var i = 0; i < n - 1; i += 1) {
    var angle = +prompt()
    var angle_ps = angle + angle_ps
  }

  var angle_one = (n - 2) * 180 - angle_ps
  console.log(angle_one)
</script>

<script id="ch0105/09" type="1.5.9">
  var m = +prompt()
  var n = +prompt()
  var odd_sum = 0

  for (; m <= n; m++) {
    if (m & 2 != 0) {
      odd_sum = m + odd_sum
    }
  }

  console.log(odd_sum)
</script>

<script id="ch0105/10" type="1.5.10">
  var m = +prompt()
  var n = +prompt()
  var sum = 0

  for (; m <= n; m++) {
    if (m % 17 == 0) {
      sum = m + sum
    }
  }

  console.log(sum)
</script>

<script script id="ch0105/11" type="1.5.11">
  var k = +prompt()
  var count1 = 0
  var count5 = 0
  var count10 = 0

  for (var i = 0; i < k; i++) {
    var count = +prompt()

    if (count === 1) {
      count1 = count1 + 1
    } else if (count === 5) {
      count5++
    } else if (count === 10) {
      count10++
    }
  }

  console.log(count1, count5, count10)
</script>

<script id="ch0105/12" type="1.5.12">
  var N = +prompt()
  var m = +prompt()
  var count_number = 0

  for (var i = 0; i < N; i++) {
    var count = +prompt()

    if (count == m) {
      count_number = count_number + 1
    }
  }

  console.log(count_number)
</script>

<script id="ch0105/13" type="1.5.13">
  var a = +prompt()
  var n = +prompt()
  var num = a

  for (var i = 0; i < n - 1; i++) {
    num = num * a
  }
  console.log(num)
</script>

<script id="ch0105/14" type="1.5.14">
  var x = +prompt()
  var n = +prompt()
  var num = x

  for (var i = 0; i < n; i++) {
    num = num * (1 + 0.001)
  }
  var people = num.toFixed(4)

  console.log(people)
</script>

<script id="ch0105/15" type="1.5.15">
  var R = +prompt()
  var M = +prompt()
  var Y = +prompt()
  var num = M

  for (var i = 0; i < Y; i++) {
    num = num * (1 + R / 100)
  }
  var money = Math.floor(num)

  console.log(money)
</script>

<script id="ch0105/16" type="1.5.16">
  var N = +prompt()
  var K = +prompt()
  var num = 200 / (1 + K / 100)      //第一年需要是200，当m=1 num=200

  for (var M = 1;; M++) {
    num = num * (1 + K / 100)
    if (M <= 20 && M * N > num) {
      console.log(M)
      break;
    } else if (M > 20) {
      console.log("impossible")
      break;
    }
  }
</script>

<script id="ch0105/17" type="1.5.17">
  var k = +prompt()
  var last = 1
  var future = 1
  debugger

  for (var i = 0; i < k - 2; i++) {
    var result = last + future
    last = future
    future = result
  }

  console.log(result)
/* 形如
b=b+a
a=b-a  迭代
*/

</script>

<script id="ch0105/18" type="1.5.18">
  var n = +prompt()
  var coc_sum = +prompt()
  var coc_eff = +prompt()
  var x = coc_eff / coc_sum

  for (var i = 0; i < n - 1; i++) {
    var cha_sum = +prompt()
    var cha_eff = +prompt()
    var y = cha_eff / cha_sum

    if (x - y > 0.05) {
      console.log('worse')
    } else if (y - x > 0.05) {
      console.log('better')
    } else {
      console.log('same')
    }
  }
</script>

<script id="ch0105/19" type="1.5.19">
  var n = +prompt()

  for (var i = 0; i < n; i++) {
    var x = +prompt()
    var y = +prompt()
    var num = +prompt()

    var dis = Math.sqrt(x * x + y * y)
  }

  var time = Math.ceil((dis / 50) * 2 + num * 1 + num * 0.5)

  console.log(time)
</script>

<script id="ch0105/20" type="1.5.20">
  var h = +prompt()
	var sum = 0
	
	for (var i = 0; i < 10; i++) {
		h = h / 2
		sum = sum + h * 2
	}
	
	var sum_all = (sum + 20 - h * 2).toFixed(4)  // 第一次落地 最后一次回弹
	
	console.log(sum_all, h.toFixed(7)) 
</script>

<script id="ch0105/21" type="1.5.21">
  var n = +prompt()

  for (var i = 0;; i++) {
    if (n % 2 == 1) {
      n = n * 3 + 1
      console.log((n - 1) / 3 + "*3+1=" + n)
    } else if (n % 2 == 0) {
      n = n / 2
      console.log(2 * n + "/2=" + n)
      if (n === 2) {
        console.log("2/2=1")
        break
      }
    }
  }

  console.log("End")
</script>

<script id="ch0105/22" type="1.5.22">
  var rest = 0
  var mom = 0
  
  for (var i = 1; i <= 12; i++) {
    var budget = +prompt()
    rest = 300 + rest - budget
    if (rest > 0) {
      while (rest >= 100) {
        rest -= 100
        mom += 100
      }
    } else if (rest < 0) {
      console.log("-" + i)
      break
    }
    if (i == 12) {
      var sum = mom * (1 + 0.2) + rest
      console.log(sum)
    }
  }
</script>

<script id="ch0105/23" type="1.5.23">
  var m = +prompt()
  var n = +prompt()
  var x
  var y = 0
  var a = 0
  debugger

  for (var i = 0; i < n; i++) {
    x = +prompt()
    y = y + x
    if (y > m) {
      y = y - x
      a += 1
    }
  }

  console.log(a)
</script>

<script id="ch0105/24" type="1.5.24">
  var n = +prompt()
  var big
  var small
  var normal = (big >= 90 && big <= 140) && (small >= 60 && small <= 90)
  var maxcontinues = 0
  var continues = 0

  for (var i = 0; i < n; i++) {
    big = +prompt()
    small = +prompt()
    if (normal==true) {
      continues ++
    } else if(normal==false) {
      if(continues>maxcontinues){
        maxcontinues =continues
      }else{
        continues = 0
      }
    }
  }

  console.log(normal)
</script>

<script id="ch0105/25" type="1.5.25">
  var a
  var b
  var c

  for (c = 1; c < 7; c++) {  //首位不能等于0    进位依次循环
    for (a = 1; a < 7; a++) {  //首位不能等于0
      for (b = 0; b < 7; b++) {
        if ((c * 1 + b * 7 + a * 7 * 7) === (a * 1 + b * 9 + c * 9 * 9)) {    
          var seven = +(a + "" + b + "" + c)
          var nine = +(c + "" + b + "" + a)
          var ten = c * 1 + b * 7 + a * 7 * 7
          console.log(ten, seven, nine)
        }
      }
    }
  }
</script>

<script id="ch0105/26" type="1.5.26">
  var a
  var b
  var c
  var d
  var n = +prompt()
  var x = 0

  for (var i = 0; i < n; i++) {
    var number = +prompt()
    a = parseInt((number / 1000) % 10)
    b = parseInt((number / 100) % 10)
    c = parseInt((number / 10) % 10)
    d = (number) % 10
    if (d - a - b - c > 0) {
      x += 1
    }
  }

  console.log(x)
</script>

<script id="ch0105/27" type="1.5.27">
  var k = +prompt()
  var S = 1

  for (var i = 2;; i++) {
    S = S + 1 / i
    if (S > k) {
      console.log(i)
      break
    }
  }
</script>

<script id="ch0105/28" type="1.5.28">
  var n = +prompt()
  var m

  for (var i = 0;; i++) {
    if (n > 0) {
      m = n % 10
      n = parseInt(n / 10)
      console.log(m)
    } else {
      break
    }
  }
</script>

<script id="ch0105/29" type="1.5.29">
  var n = +prompt()
  var m = 0

  for (var i = 0;; i++) {
    while (n != 0) {
      m = m * 10 + n % 10
      n = parseInt(n / 10)
    }
    break
  }

  console.log(m)
</script>

<script id="ch0105/30" type="1.5.30">
  var m = +prompt()
  var k = +prompt()
  var n = 0
  debugger
  
  if (m % 19 === 0) {
    for (var i = 0;; i++) {
      if (m % 10 == 3) {
        n += 1
      }
      m = parseInt(m / 10)
      if (n === k) {
        console.log("Yes")
        break
      }
    }
  } else {
    console.log("No")
  }
</script>

<script id="ch0105/32" type="1.5.32">
  var p = 1
  var q = 1
  var n = +prompt()
  var sum = 0

  for (var i = 0; i < n; i++) {
    p = p + q // 2 = 1 + 1, 3 = 2 + 1, 5 = 3 + 2     
    q = p - q // 1 = 2 - 1, 2 = 3 - 1, 3 = 5 - 2
    sum = sum + p / q
  }
  console.log(sum.toFixed(4))
</script>

<script id="ch0105/33" type="1.5.33">
  var n = +prompt()
  var sum = 0

  for (var i = 2; i <= n; i += 2) {
    sum = sum + (1 / (i - 1) - 1 / i)
  }
  console.log(sum.toFixed(4))
</script>

<script id="ch0105/34" type="1.5.34">
  var n = +prompt()
  var sum = 0
  var m = 1
  debugger

  for (var i = 0; i < n; i++) {
    m = m * (i + 1)   //第i项 m 的阶乘
    sum = sum + m
  }
  console.log(sum)
</script>

<script id="ch0105/35" type="1.5.35">
  var n = +prompt()
  var X = 0
  var sum
  var m = 1

  for (var i = 0; i < n; i++) {
    m = m * 1 / (i + 1)
    X = X + m
  }
  sum = (X + 1).toFixed(10)
  console.log(sum)
</script>

<script id="ch0105/36" type="1.5.36">
  var x = +prompt()
  var n = +prompt()
  var sum = 0
  var m

  for (var i = n; i > 0; i--) {
    m = Math.pow(x, i)
    sum = sum + m
  }
  sum = (sum + 1).toFixed(2)
  console.log(sum)

  /*

var x = +prompt()
var c = +prompt()
var p = 1
var sum = 0

for(var i = 0; i <= c; i++) {
  sum += p
  p *= x     第i项的值
}

console.log(sum)

  */
</script>

<script id="ch0105/39" type="1.5.39">
  var n, has7, digit, sum = 0
  var x = +prompt()

for (var i = 1; i <= x; i++) {
  if (i % 7 != 0) {
    n = i
    has7 = false
    while (n > 0) {
      digit = n % 10
      if (digit === 7) {
        has7 = true      
        break
      }
      n = (n - digit) / 10
    }

    if (has7 ==true) {  //  has7 == true 跳出内部循环 
      continue
    }

    sum += i * i
  }
}
console.log(sum)


/*
// 此函数用来判断n的各个位上有是否出现过7
// 出现过返回true
// 没有出现过返回false
var numDigitHas7 = function(n) {
  while(n > 0) {
    var digit = n % 10
    if (digit == 7) {
      return true
    }
    n = (n - digit) / 10
  }
  return false
}
*/

</script>

<script id="ch0105/43" type="1.5.43">
  var n = +prompt()
  var result = ''
  debugger

  for (var i = 2; i <= n; i++) {
    if (n % i === 0) {
      if (n === i) { //当 n === i 则是最后一个整除的数也是最大的数 
        console.log(i)
      }
      n = n / i     //若继续能够被 i 整除则继续整除
      i--
    }
  }

/*
var n = +prompt()
var result = ''
for(var i = 2; i <= n; i++) {
  if (n % i === 0) {
    if (n === i) {
      result += i
    } else {
      result += i + '*'
    }
    n = n / i
    i--
  }
}

console.log(result)

*/
</script>

<script id="sort" sample-input="4 1 7" sample-output="1 4 7" comment="输入三个数，把此三个数按升序输出">
  var a = +prompt()
  var b = +prompt()
  var c = +prompt()
  var mid
  debugger

  //最小值放左边，最大值放右边

  if (a > b) {
    mid = a
    a = b
    b = mid
  }
  if (b > c) {
    mid = b
    b = c
    c = mid
  }
  if (a > b) {
    mid = a
    a = b
    b = mid
  }

  console.log(a, b, c)
</script>

题目：水仙花数。水仙花数是指一个N位的十进制数，其各位数的N次方的和等于它自己。
如：153 =　1的三次方+5的三次方+3的三次方，则153就是一个水仙花数
或：1634 =　1的四次方+6的四次方+3的四次方+4的四次方
因为1634是一个四位数。
找出100到100000以内所有的水仙花数。
<script id="narcissistic " sample-input="153" sample-output="YES" comment="判断一个数是否为水仙花数">
  var number = prompt()
  var x = number.toString()
  var L = x.length
  var result = 0
  var a

  for (var i = 0; i < L; i++) {
    a = x % 10
    result = result + Math.pow(a, L)
    x = (x - a) / 10
  }

  if (result == number) {
    console.log("Yes")
  } else {
    console.log("No")
  }
</script>
<script id="narcissistics" sample-input="" sample-output="" comment="找出100到10000以内所有的水仙花数">
  var x
  var L
  var a

  for (var number = 100; number <= 10000; number++) {
    var result = 0
    x = number.toString()
    L = x.length
    for (var j = 0; j < L; j++) {
      a = x % 10
      result = result + Math.pow(a, L)
      if (result === number) {
        console.log(number)
      }
      x = (x - a) / 10
    }
  }
</script>
<script id="palindrom" sample-input="12321" sample-output="YES" comment="判断一个非负整数是否为回文数字">
  var n = +prompt()
  var x = n
  var m = 0

  for (var i = 0;; i++) {
    while (x != 0) {
      m = m * 10 + x % 10
      x = parseInt(x / 10)
    }
    break
  }

  if (m === n) {
    console.log("Yes")
  }
</script>

<script id="weekday" sample-input="2018 6" sample-output="5" comment="输入年份与月份，给出该年该月的第一天是星期几">

</script>
<script id="complete-number" sample-input="6" sample-output="YES" comment="判断一个数是否为完全数">
  var number = +prompt()
  var sum = 0

  for (var i = 1; i < number; i++) {
    if (number % i == 0) {
      sum = sum + i
    }
  }

  if (sum === number) {
    console.log("Yes")
  } else {
    console.log("No")
  }
</script>
<script id="complete-numbers" sample-input="" sample-output="" comment="输出10000以内所有的完全数">
  var number
  var sum

  for (var number = 2; number < 10000; number++) {
    sum = 0
    for (var i = 1; i < number; i++) {
      if (number % i == 0) {
        sum = sum + i
        if (sum === number) {
          console.log(number)
        }
      }
    }
  }
</script>
<script id="prime" sample-input="7" sample-output="YES" comment="判断一个数是否为素数">
  var number = +prompt()
  var prime

  for (var i = 2; i < number; i++) {
    if (number % i == 0) {
      prime = false
      break
    }
    prime = true
  }!prime ? console.log("No") : console.log("Yes")
</script>
<script id="primes" sample-input="" sample-output="" comment="输出100以内所有的素数">
  var number
  var prime

  for (var number = 2; number < 100; number++) {
    for (var i = 2; i < number; i++) {
      if (number % i == 0) {
        prime = false
        break
      }
      prime = true
    }
    if (number == 2) {
      prime = true
    }
    if (prime == true) {
      console.log(number)
    }
  }
</script>
<script id="itob" sample-input="123" sample-output="123" comment="数字转换成字符串，即实现Number函数的功能，不可使用+号或者Number函数">
  var str
  var num = function (str) {
    var c
    var n = 0
    for (var i = 0; i < str.length; i++) {
      c = str[i] - "0"
      n = n * 10 + c
    }
    return n
  }
  str = +prompt()
</script>
<script id="lcf&lcm" sample-input="12 9" sample-output="36 3" comment="给定两个数，求它们的最小公倍数和最大公约数">
  var result = 1
  var min_d
  var Max_m_Min_d = function (m, n) {
    var m
    var n
    for (var i = 2; i <= m && i <= n; i++) {
      if (m % i == 0 && n % i == 0) {
        result = result * i
        n = n / i
        m = m / i
        i--
      }
      if (m === i || n === i) {
        x = m
        y = n
        min_d = result * x * y
      }
    }
    return result, min_d
  }

  var m = +prompt()
  var n = +prompt()
  if (Max_m_Min_d(m, n)) {
    console.log(result, min_d)
  }
</script>

题目：敲7。输出1到100以内所有7的倍数以及数字中包含7的数，如7（7的倍数），37（不是倍数但数位中包含7）都需要输出，依次类推
<script id="7" sample-input="" sample-output="" comment="敲7，输出7的倍数或数位中含有7的数如（21，27）">
  var numberDigitHas7 = function (n) {
    while (n > 0) {
      var digit = n % 10
      if (digit == 7) {
        numberDigitHas7 = true
      }
      n = (n - digit) / 10
    }
  }

  for (var i = 1; i < 100; i++) {
    if (i % 7 == 0 && numberDigitHas7 == true) {
      console.log(i)
    }
  }
</script>
<script id="sqrt" sample-input="2" sample-output="1.414" comment="不使用Math.sqrt，求一个非负数的平方根，至少精确到小数点后3位">

</script>

给定M和N，求从M个物体中选出N个的排列与组合的数量：
Ｃ（ｍ，ｎ）
Ａ（ｍ，ｎ）
<script id="c&a">

</script>

题目：给定一个数，对其进行四舍五入，如1.4输出1，1.6输出2
<script id="round">

</script>






<script 题目：把单词转换成拨号键盘上的数字。 如“dell”转换成3355.“alienware”转换成254369273>
  var Alphabet2Number = function (Alphabet) {
    var result = ""
    var str = String(Alphabet)

    for (var i = 0; i < str.length; i++) {
      n = str[i]
      var baby
      switch (n) {
        case "a":
        case "b":
        case "c":
          baby = '2';
          break;
        case "d":
        case "e":
        case "f":
          baby = '3';
          break;
        case "g":
        case "i":
        case "h":
          baby = '4';
          break;
        case "j":
        case "k":
        case "l":
          baby = '5';
          break;
        case "m":
        case "n":
        case "o":
          baby = '6';
          break;
        case "p":
        case "q":
        case "s":
        case "r":
          baby = '7';
          break;
        case "t":
        case "u":
        case "v":
          baby = '8';
          break;
        case "w":
        case "x":
        case "y":
        case "z":
          baby = '9';
          break;
      }
      result = result + baby
    }


    return result
  }
</script>

<script 题目：找出唯一的满足a + b + c = 1000的毕达哥拉斯三元组{a, b, c}。
一个毕达哥拉斯三元组是一个包含三个自然数的集合，a<b<c，满足条件：
a^2 + b^2 = c^2例如：3^2 + 4^2 = 9 + 16 = 25 = 5^2.（说白了就是一组勾股数）
已知存在并且只存在一个毕达哥拉斯三元组满足条件a + b + c = 1000。
找出这个三元组。
题目中a^b代表a的b次方（这是一个通用表示法） 。
>
for(var a =0;a<1000;a++){
  for(var b=0;b<1000;b++){
    for(var c=0;c<1000;c++){
      if(Math.pow(a,2)+Math.pow(b,2)==Math.pow(c,2)){
        if(a+c+b==1000 && a<b &&b <c){
          console.log(a,b,c)
        }
      }
    }
  }
}
</script>


<script 题目：将一个数字的各位加起来求和。如果该和大于10，将得到这个数字继续进行这种操作，直到其只有一位数。>
var num = prompt()
var digit

while (String(num).length != 1) {
  var count = 0
  var result = 0
  var a = num
  for (var i = 0; i < String(num).length; i++) {
    digit = a % 10
    count++
    result = result + digit
    a = (a - digit) / 10
  }
  if (count == String(num).length) {
    num = result
  }
}

if(String(num).length ==1){
  result = num
}

console.log(result)





/*  //声明的位置很重要    大括号内外   条件内部位置顺序
var num = prompt()
var digit
var len = num.toString().length  //判断 while 条件

while (len != 1) {
  len = num.toString().length   //判断大括号里面的条件。且必须在 result 被赋值为0之前
  var count = 0
  var result = 0
  var a = num
  for (var i = 0; i < len; i++) {
    digit = a % 10
    count++
    result = result + digit
    a = (a - digit) / 10
  }
  if (count == len) {
    num = result
  }
}

if(len ==1){
  result = num
}

console.log(result)

*/
</script>