Compilare: user.cpp: In function ‘void bfs()’: user.cpp:31:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[Nod].size(); ++ i) ^ user.cpp: In function ‘long long int fluxmax()’: user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[n].size(); ++ j){ ^ user.cpp: In function ‘int main()’: user.cpp:77:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("symmetricgraph2.in", "r", stdin); ^ user.cpp:78:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("symmetricgraph2.out", "w", stdout); ^ user.cpp:79:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:83:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lld", &a, &b, &c); ^