2019冬季PAT甲级第三题

 1 #define HAVE_STRUCT_TIMESPEC
 2 #include<bits/stdc++.h>
 3 using namespace std;
 4 set<int>v[207];
 5 int a[207];
 6 int vis[207];
 7 int main(){
 8     ios::sync_with_stdio(false);
 9     cin.tie(NULL);
10     cout.tie(NULL);
11     int n,m;
12     cin>>n>>m;
13     for(int i=1;i<=m;++i){
14         int x,y;
15         cin>>x>>y;
16         v[x].insert(y);
17         v[y].insert(x);
18     }
19     int k;
20     cin>>k;
21     for(int i=1;i<=k;++i){
22         int num;
23         cin>>num;
24         if(num==0){
25             cout<<"Area "<<i<<" needs help.";
26                 cout<<"\n";
27             continue;
28         }
29         for(int j=1;j<=num;++j)
30             cin>>a[j];
31         int flag=0;
32         for(int k=1;k<=num;++k){
33             for(int j=1;j<=num;++j){
34                 if(k==j)
35                     continue;
36                 if(!v[a[k]].count(a[j])){
37                     flag=1;
38                 }
39             }
40         }
41         if(flag){
42             cout<<"Area "<<i<<" needs help.";
43                 cout<<"\n";
44             continue;
45         }
46         memset(vis,0,sizeof(vis));
47         for(int j=1;j<=num;++j){
48             for(auto it:v[a[j]])
49                 ++vis[it];
50         }
51         int ans=0;
52         for(int j=1;j<=n;++j)
53             if(vis[j]==num){
54                 ans=j;
55                 break;
56             }
57         if(ans){
58             cout<<"Area "<<i<<" may invite more people, such as "<<ans<<".";
59                 cout<<"\n";
60             continue;
61         }
62         cout<<"Area "<<i<<" is OK.";
63         cout<<"\n";
64     }
65     return 0;
66 }