foo.cc: In function 'int main()':
foo.cc:4:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
4 | #define FIN freopen("D://debug//in.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:64:5: note: in expansion of macro 'FIN'
64 | FIN
| ^~~
foo.cc:67:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
67 | scanf("%d%d", &n, &k);
| ~~~~~^~~~~~~~~~~~~~~~
foo.cc:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
73 | scanf("%d%d%d", &op, &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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