walls.cpp: In function 'int main()':
walls.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
13 | scanf("%d %d", &n, &k);
| ~~~~~^~~~~~~~~~~~~~~~~
walls.cpp:14:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
14 | for(int i=1; i<=n; i++) scanf("%lld %lld", &a[i], &b[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
walls.cpp:15:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
15 | for(int i=1; i<=k; i++) scanf("%lld", &arr[i]);
| ~~~~~^~~~~~~~~~~~~~~~~