Compilare: main.cpp: In function 'bool bfs(int, int)': main.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[n].size(); i++) ~^~~~~~~~~~~~ main.cpp:32:37: 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:33:40: 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:35:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:37:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^