View Compilation Error

0_0_23343571_12996.cpp: In function 'int** dm(int, int)':
0_0_23343571_12996.cpp:10:47: error: 'malloc' was not declared in this scope
     int *t = (int *)malloc(sizeof(int) * n * m);
                                               ^
0_0_23343571_12996.cpp: In function 'void deld(int**)':
0_0_23343571_12996.cpp:21:13: error: 'free' was not declared in this scope
     free(*pp);
             ^