1134. Vertex Cover (25)
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#include<cstdio>#include<vector>#include<set>using namespace std;const int maxn=10010;struct Edge{ int a,b;};int main(){ int n,m; scanf("%d%d",&n,&m); vector<Edge> edges; for(int i=0;i<m;i++){ int a,b; Edge t; scanf("%d%d",&t.a,&t.b); edges.push_back(t); } int k; scanf("%d",&k); while(k--){ int na; scanf("%d",&na); set<int> poi; for(int i=0;i<na;i++){ int t; scanf("%d",&t); poi.insert(t); } bool flag=true; for(int i=0;i<m;i++){ if(poi.find(edges[i].a)==poi.end()&&poi.find(edges[i].b)==poi.end()){ flag=false; break; } } if(flag==true) printf("Yes\n"); else printf("No\n"); } return 0;}
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