Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < ad[crt].size(); i++) ^ user.cpp:16:10: warning: unused variable ‘j’ [-Wunused-variable] long i, j, crt; ^ user.cpp: In function ‘int main()’: user.cpp:45:10: warning: unused variable ‘j’ [-Wunused-variable] long i, j; ^ user.cpp:46:35: 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); ^ user.cpp:47:37: 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); ^ user.cpp:48:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld", &N, &M); ^ user.cpp:50:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld", &a, &b, &c); ^