Compilare: main.cpp: In function 'int main()': main.cpp:105:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j = 1; j < lant[i].size(); ++j) { ~~^~~~~~~~~~~~~~~~ main.cpp:110:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j = 0; j < lant[i].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:77:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pensula.in", "r", stdin); ^ main.cpp:78:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pensula.out", "w", stdout); ^ main.cpp:81:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld", &n, &m, &qr, &c); ^ main.cpp:83:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &papa[i]); ^