View Compilation Error

0_0_20193976_2368.cpp: In function 'int main()':
0_0_20193976_2368.cpp:48:39: error: 'sort' was not declared in this scope
    sort(pp[i].score,pp[i].score+n,cmp1);
                                       ^
0_0_20193976_2368.cpp:49:20: error: 'sort' was not declared in this scope
   sort(pp,pp+m,cmp2);
                    ^