/in/foo.cc: In function 'int main()':
/in/foo.cc:7:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d%d", &n, &m, &p);
                            ^
/in/foo.cc:10:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 int x, y; scanf("%d%d", &x, &y);
                                ^