Compilare: main.cpp: In function 'int main()': main.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edges[x].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:88:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edges[u].size(); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp:19:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.in", "r", stdin); ^ main.cpp:20:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.out", "w", stdout); ^ main.cpp:33:16: warning: iteration 50000 invokes undefined behavior [-Waggressive-loop-optimizations] if (f[i]) ~~~^ main.cpp:32:23: note: within this loop for (int i = 1; i <= MAX_D; i++) ~~^~~~~~~~