mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
115 lines
2.3 KiB
C++
115 lines
2.3 KiB
C++
#include<stdio.h>
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#include<string.h>
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#include<map>
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using namespace std;
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map<int,int> ha[35];
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int vis[35];
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int n,v,k;
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int flag;
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int constraint;
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int g[35][35];
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struct node
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{
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int w;
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int cons;
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}t[35],s[35];
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void dfs(int y,int x,int cur)
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{
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if(y>k) return;
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else if(x==constraint) ha[y][cur]=1;
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else
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{
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int tt=0;
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if(s[x].cons!=-1)
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{
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for(int i=0;i<n;i++) if(g[x][i])
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{
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if(vis[i])
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{
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tt=1;
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break;
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}
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}
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}
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if(s[x].cons==-1||!tt)
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{
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vis[x]=1;
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dfs(y+1,x+1,cur+s[x].w);
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vis[x]=0;
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}
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dfs(y,x+1,cur);
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}
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}
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void dfs2(int y,int x,int cur)
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{
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if(y>k) return;
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else if(x==n)
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{
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if(ha[k-y][v-cur]==1)
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{
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flag=1;
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return;
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}
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}
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else if(!flag)
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{
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dfs2(y+1,x+1,cur+s[x].w);
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dfs2(y,x+1,cur);
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}
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}
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int main()
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{
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int i,j;
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int T;
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int m;
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int mark[35];
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scanf("%d",&T);
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while(T--)
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{
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scanf("%d%d%d%d",&n,&m,&k,&v);
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for(i=0;i<n;i++)
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{
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scanf("%d",&t[i].w);
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t[i].cons=-1;
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s[i].cons=-1;
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}
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int cnt=0;
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memset(mark,-1,sizeof(mark));
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memset(g,0,sizeof(g));
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for(i=0;i<m;i++)
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{
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int t1,t2;
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int c1,c2;
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scanf("%d%d",&t1,&t2);
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t1--;
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t2--;
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if(mark[t1]==-1) mark[t1]=cnt++;
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if(mark[t2]==-1) mark[t2]=cnt++;
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c1=mark[t1];
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c2=mark[t2];
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s[c1].cons=c2;
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s[c1].w=t[t1].w;
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t[t1].cons=t2;
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t[t2].cons=t1;
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s[c2].cons=c1;
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s[c2].w=t[t2].w;
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g[c1][c2]=1;
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g[c2][c1]=1;
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}
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if(cnt>n/2) constraint=cnt;
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else constraint=n/2+1;
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for(i=0;i<n;i++) if(t[i].cons==-1)
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{
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s[cnt++]=t[i];
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}
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for(i=0;i<=k;i++)
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ha[i].clear();
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memset(vis,0,sizeof(vis));
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dfs(0,0,0);
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flag=0;
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dfs2(0,constraint,0);
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if(flag) printf("YES\n");
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else printf("NO\n");
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}
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}
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