View Compilation Error

0_0_22950332_30595.cpp: In function 'void initHeap()':
0_0_22950332_30595.cpp:85:33: error: 'memset' was not declared in this scope
     memset(Heap, 0, sizeof(Heap));
                                 ^
0_0_22950332_30595.cpp: In function 'int main()':
0_0_22950332_30595.cpp:173:36: error: 'sort' was not declared in this scope
         sort(vec.begin(), vec.end());
                                    ^