Accepted
foo.cc: In function 'int main()':
foo.cc:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
52 | scanf("%d%d%d%d",&n,&m,&r,&c);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
55 | scanf("%d",a[i]+j);
| ~~~~~^~~~~~~~~~~~~
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