Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:10:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(int i = 0; i < v[nod].size();i++) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void solve(int)’: user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(j = 0; j < v[nod].size();j++) ~~^~~~~~~~~~~~~~~ user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l = 0; l < v[nod].size(); l++) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:36:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("iepuri2.in","r",stdin); ^ user.cpp:37:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("iepuri2.out","w",stdout); ^ user.cpp:39:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:42:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d",&l,&m); ^