[300] - solutions

tips/300.md

@@ -72,4 +72,65 @@ template<std::size_t ix>
 }
  ```
  
- > https://godbolt.org/z/W9Y6zbbMT
+> https://godbolt.org/z/W9Y6zbbMT
+
+```cpp
+[[nodiscard]] consteval auto to_string(auto bitset){
+    return bitset.to_string();
+}
+```
+
+> https://godbolt.org/z/odjMYz9hd
+
+```cpp
+template <std::size_t N>
+[[nodiscard]] consteval auto to_string(std::bitset<N> bitset) {
+  return [&]<std::size_t... Is>(std::index_sequence<Is...>) -> std::string {
+    return {(bitset.test(N - Is - 1uz) ? '1' : '0')...};
+  }(std::make_index_sequence<N>{});
+}
+```
+
+> https://godbolt.org/z/61bMGbYnh
+
+```cpp
+constexpr auto bit_to_char(auto bitset, std::size_t idx)
+{
+    if(bitset.test(idx))
+        return '1';
+    else
+        return '0';
+}
+
+template<size_t N>
+[[nodiscard]] constexpr auto to_string(std::bitset<N> bitset){
+    return [&]<size_t... I>(const std::bitset<N>& bits,std::index_sequence<I...>)->std::string{
+        return{(bit_to_char(bits,N-I-1))...};
+    }(bitset,std::make_index_sequence<N>{});
+}
+```
+
+> https://godbolt.org/z/h5WhYPoaE 
+
+```cpp
+template <std::size_t B>
+[[nodiscard]] consteval auto to_string(std::bitset<B> bitset){
+    return [&]<size_t... N>(std::index_sequence<N...>) -> std::string {
+        constexpr auto bit_value = [](auto bit) -> char { return bit + '0';};
+        return {(bit_value(bitset[B-N-1]))...};
+    }(std::make_index_sequence<B>());
+}
+```
+
+> https://godbolt.org/z/G4q61zGbx 
+
+```cpp
+[[nodiscard]] consteval auto to_string(auto bitset) {
+    return [&]<typename T, T...ints>(std::integer_sequence<T, ints...>) {
+        char a[] = { (bitset[sizeof...(ints) - ints -1] ? '1' : '0') ... }; 
+        return std::string(a, sizeof...(ints));
+    }(std::make_index_sequence<bitset.size()>{});
+}
+```
+
+> https://godbolt.org/z/EMW4rYnKP