View Compilation Error

0_0_18554079_22623.cpp: In function 'int main()':
0_0_18554079_22623.cpp:57:17: error: 'sort' was not declared in this scope
   sort(X , X + m);
                 ^
0_0_18554079_22623.cpp:74:10: error: expected '}' at end of input
  return 0;
          ^