Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<v[x].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ans.size() != (n-1)){ ~~~~~~~~~~~^~~~~~~~ main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~ main.cpp:31:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mesaj4.in", "r", stdin); ^ main.cpp:32:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mesaj4.out", "w", stdout); ^