Compilare: main.cpp: In function 'void solve()': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V.size();i++){ ~^~~~~~~~~ main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V.size();i++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.in","r",stdin); ^ main.cpp:62:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.out","w",stdout); ^