Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:67:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; ptr[v] < adj[v].size(); ++ptr[v]) { ~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int dinic(int)': main.cpp:86:33: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(pushed = dfs(source, INF)) flow += pushed; ^ main.cpp: In function 'int main()': main.cpp:95:35: 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); ^ main.cpp:96:37: 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); ^