View Compilation Error

0_0_25524505_31459.cpp: In function 'int main()':
0_0_25524505_31459.cpp:23:7: error: 'std::ios' has not been declared
  std::ios::sync_with_stdio(false);
       ^
0_0_25524505_31459.cpp:25:2: error: 'cin' is not a member of 'std'
  std::cin >> t;
  ^
0_0_25524505_31459.cpp:28:3: error: 'cin' is not a member of 'std'
   std::cin >> n;
   ^
0_0_25524505_31459.cpp:29:3: error: 'string' is not a member of 'std'
   std::string s;
   ^
0_0_25524505_31459.cpp:31:4: error: 'cin' is not a member of 'std'
    std::cin >> s;
    ^
0_0_25524505_31459.cpp:31:16: error: 's' was not declared in this scope
    std::cin >> s;
                ^