HEU 5015 Eular Graph
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/**************************************
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Problem: HEU 5015 Eular Graph
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Time: 0.0040 s
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Memory: 236 k
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Accepted Time: 2009-04-07 12:57:34
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Tips: 首尾相连,连成圈
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**************************************/
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#include <stdio.h>
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#include <string.h>
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struct edge
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{
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int i,j;
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}a[1000];
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int main()
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{
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int tt;
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scanf("%d",&tt);
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while(tt--)
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{
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int n,m,i,b[1000];
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scanf("%d%d",&n,&m);
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memset(b,0,sizeof(b));
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for(i=0;i<m;i++)scanf("%d%d",&a[i].i,&a[i].j);
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b[0]=1;
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int count=1;
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int temp=a[0].i,t=a[0].j;
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while(1)
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{
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for(i=1;i<m;i++)
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{
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if(b[i]==0&&t==a[i].i)
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{
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b[i]=1;
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t=a[i].j;
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count++;
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}
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}
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if(i==m||count==m)break;
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}
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if(count==m&&temp==t)printf("yes\n");
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else printf("no\n");
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}
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return 0;
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}
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