Compilare: main.cpp: In function 'int bfs(int)': main.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[u.nod].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int bs(int, int, int, int)': main.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:71:37: 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:72:39: 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); ^ main.cpp:75:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:77:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^