Compilare: user.cpp: In function ‘bool BFS()’: user.cpp:30:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:128:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[destination].size(); i ++) ^ user.cpp:89:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.in", "r", stdin); ^