View Compilation Error

0_0_38624553_10537.cpp: In function 'int main()':
0_0_38624553_10537.cpp:38:3: error: 'sort' was not declared in this scope
   sort(ans.begin(), ans.end());
   ^~~~
0_0_38624553_10537.cpp:38:3: note: suggested alternative: 'qsort'
   sort(ans.begin(), ans.end());
   ^~~~
   qsort