worm.cpp: In function 'int main()':
worm.cpp:5:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | scanf("%d %d %d %d", &n, &m, &k, &q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
worm.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
12 | scanf("%d", &v1);
| ~~~~~^~~~~~~~~~~
worm.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
15 | scanf("%d", &v2);
| ~~~~~^~~~~~~~~~~