Compilare: main.cpp: In function 'void dfs(int)': main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[u] < grafo[u].size()) ~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < lista.size(); i += 2) ~~^~~~~~~~~~~~~~ main.cpp:71:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < tour.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:79:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", ans.size()); ^ main.cpp:39:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ratway.in", "r", stdin); freopen("ratway.out", "w", stdout); ^ main.cpp:39:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ratway.in", "r", stdin); freopen("ratway.out", "w", stdout); ^ main.cpp:41:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ main.cpp:46:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &u, &v); ^