Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<adj[u].size();i++) ^ user.cpp: In function ‘int dem(int, int, int)’: user.cpp:24:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(con==E[cha].size()&&p==0) return 1; ^ user.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(con==E[cha].size()&&p!=0) return 0; ^ user.cpp: In function ‘int dp(int, int)’: user.cpp:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<E[u].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:16: warning: unused variable ‘j’ [-Wunused-variable] int n,p,u,v,i,j; ^ user.cpp:53:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radare.in","r",stdin); ^ user.cpp:54:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radare.out","w",stdout); ^ user.cpp:57:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&p); ^ user.cpp:60:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&u,&v); ^ user.cpp:66:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t[i]); ^