Compilare: main.cpp: In function 'void dfs1(int, int)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int it = 0; it < edg[x].size(); ++it) { ~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:95:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in", "r", stdin); ^ main.cpp:96:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.out", "w", stdout); ^