foo.cc: In function 'int main()':
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
9 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
foo.cc:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
15 | scanf("%d", &m[i]);
| ~~~~~^~~~~~~~~~~~~
foo.cc:18:8: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result]
18 | system("whoami");
| ~~~~~~^~~~~~~~~~
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