Compilare: main.cpp: In function 'int bfs()': main.cpp:27:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:43:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[n].size(); i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in","r",stdin); ^ main.cpp:63:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out","w",stdout); ^