Compilare: main.cpp: In function 'int main()': main.cpp:22:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<Sol.size(); ++i){ ~^~~~~~~~~~~ main.cpp:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<Sol.size(); ++i) S=S+Sol[i].val*Sol[i].ind-T; ~^~~~~~~~~~~ main.cpp:13:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("euro.in", "r", stdin); ^ main.cpp:14:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("euro.out", "w", stdout); ^ main.cpp:15:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &N, &T); ^ main.cpp:17:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^