Compilare: main.cpp: In function 'int main()': main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i <= n ; i++) ~~^~~~ main.cpp:24:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abx.in","r",stdin); ^ main.cpp:25:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abx.out","w",stdout); ^ main.cpp:26:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&n,&m); ^ main.cpp:29:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&x); ^