Compilare: user.cpp: In function ‘void bfs()’: user.cpp:28:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[u1].size(); ++ k) { ^ user.cpp: In function ‘int dfs(int)’: user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[u1].size(); ++ k) { ^ user.cpp: In function ‘int main()’: user.cpp:81:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.in", "r", stdin); ^ user.cpp:82:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.out", "w", stdout); ^ user.cpp:84:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &u ,&v, &m); ^ user.cpp:88:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^