Compilare: user.cpp: In function ‘int main()’: user.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind[*it]<f[*it].size() && f[*it][ind[*it]]<i) ~~~~~~~~^~~~~~~~~~~~~~ user.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind[*it]<f[*it].size()){ ~~~~~~~~^~~~~~~~~~~~~~ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("taietura.in", "r",stdin); ^ user.cpp:24:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taietura.out", "w",stdout); ^ user.cpp:26:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^