Compilare: main.cpp: In function 'int verif(int)': main.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v.size() ; i ++) ~~^~~~~~~~~~ main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v[i].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:24:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.length() == l) ~~~~~~~~~~~^~~~ main.cpp:29:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == v.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:36:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == v.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:41:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:63:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("subsecvente2.in" , "r" , stdin); ^ main.cpp:64:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("subsecvente2.out" , "w" , stdout); ^ main.cpp:67:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n" , &n); ^