Compilare: user.cpp: In function ‘int find_cicle(std::vector<edge>, int, int, std::vector<bool>, std::vector<int>&)’: user.cpp:17:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<edges.size(); ++i) ^ user.cpp:18:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(edges[i].x == x && visited[edges[i].y] == 0) ^ user.cpp: In function ‘int main()’: user.cpp:93:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<cicle.size(); ++j) ^ user.cpp:38:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gcycle.in", "r", stdin); ^ user.cpp:39:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gcycle.out", "w", stdout); ^ user.cpp:45:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:52:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &edges[i].x, &edges[i].y); ^