Compilare: main.cpp: In function 'int dfs(int, int, int)': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; ptr[x] < edg[x].size() && fl; ++ptr[x]) { ~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:30: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while (nfl = dfs(1, n)) { ^ main.cpp:55:38: 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:56:40: 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); ^