Compilare: user.cpp: In function ‘int main()’: user.cpp:49:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it[node] < graph[node].size() && used[graph[node][ it[node] ]] == graph[ graph[node][it[node]] ].size()) ^ user.cpp:49:117: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it[node] < graph[node].size() && used[graph[node][ it[node] ]] == graph[ graph[node][it[node]] ].size()) ^ user.cpp:55:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(used[dad] == graph[dad].size() - 1) ^ user.cpp:24:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in", "r", stdin); ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out", "w", stdout); ^ user.cpp:28:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^