View Compilation Error

0_0_16501807_2537.cpp: In function 'int main()':
0_0_16501807_2537.cpp:23:25: error: 'sort' was not declared in this scope
   sort(rooms,rooms+N,cmp);
                         ^
0_0_16501807_2537.cpp:32:4: error: expected ';' before '}' token
    }
    ^