foo.cpp: In function 'int main()':
foo.cpp:22:21: error: 'scanf' was not declared in this scope
 scanf("%d%d", &n, &m);
                     ^
foo.cpp:34:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 while(buf = Q[front ++]) {
                       ^
foo.cpp:41:26: error: 'printf' was not declared in this scope
 printf("%d\n", DP[buf][m]);
                          ^
foo.cpp:42:15: error: 'system' was not declared in this scope
 system("pause");
               ^