Compilare: main.cpp: In function 'void verifica()': main.cpp:20:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<v[i].size();j++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("reteta.in","r",stdin); ^ main.cpp:60:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("reteta.out","w",stdout); ^ main.cpp:62:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:67:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&t,&lg); ^ main.cpp:72:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val); ^ main.cpp:79:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cost[i]); ^