uva 10763
2017-07-20 11:21
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#include<cstdio> #include<cstring> using namespace std; int d[1010][1010]; int ok(int n) { for(int i=0;i<500;i++) for(int j=0;j<500;j++) if(d[i][j]) return 0; return 1; } int main() { int n; while(~scanf("%d",&n)&&n) { memset(d,0,sizeof(d)); for(int i=0;i<n;i++) { int a,b; scanf("%d%d",&a,&b); d[a][b]++; d[b][a]--; } if(n&1) printf("NO\n"); else if(ok(n)) printf("YES\n"); else printf("NO\n"); } }
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