Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:49:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[a].size();i++) ^ user.cpp: In function ‘void max_flow()’: user.cpp:69:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[n].size();i++) ^ user.cpp: In function ‘void dfs(bool*, int)’: user.cpp:95:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[vert].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:126:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < sol.size();i++) ^ user.cpp: In function ‘edge make_edge()’: user.cpp:28:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&aux.x,&aux.y,&aux.r); ^ user.cpp: In function ‘int main()’: user.cpp:102:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.in","r",stdin); ^ user.cpp:103:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.out","w",stdout); ^ user.cpp:105:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^