View Compilation Error

0_0_17832737_21583.cpp: In function 'int main()':
0_0_17832737_21583.cpp:25:41: error: 'malloc' was not declared in this scope
    int *a = (int*)malloc(sizeof(int) * n);
                                         ^
0_0_17832737_21583.cpp:55:10: error: 'free' was not declared in this scope
    free(a);
          ^