/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d", &m);
  ^~~~~
/in/foo.c:7:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:7:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:11:8: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration]
  sum = pow(b, 3) + pow(c, 3) + pow(d, 3);
        ^~~
/in/foo.c:11:8: warning: incompatible implicit declaration of built-in function 'pow'
/in/foo.c:11:8: note: include '<math.h>' or provide a declaration of 'pow'
/in/foo.c:13:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   printf("YES");
   ^~~~~~
/in/foo.c:13:3: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:13:3: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:15:3: warning: incompatible implicit declaration of built-in function 'printf'
   printf("NO");
   ^~~~~~
/in/foo.c:15:3: note: include '<stdio.h>' or provide a declaration of 'printf'