Compilare: user.cpp: In member function ‘LL Dinic::DFS(int, int, LL)’: user.cpp:51:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int &i = pt[u]; i < g[u].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:80:34: 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:81:36: 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:83:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &E); ^ user.cpp:89:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lld", &u, &v, &cap); ^