Compilare: main.cpp: In function 'int main()': main.cpp:45:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[u].size();++i){ ~^~~~~~~~~~~~ main.cpp:70:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[u].size();++i){ ~^~~~~~~~~~~~ main.cpp:93:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[u].size();++i){ ~^~~~~~~~~~~~ main.cpp:14:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.in","r",stdin); ^ main.cpp:15:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.out","w",stdout); ^ main.cpp:20:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&caz,&n,&m); ^ main.cpp:23:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %s",&u,&v,s); ^