http://poj.org/problem?id=1308 #include<iostream> using namespace std; short ins[50000]; bool bb[50000]; int main() { int a,b,c=1; int i; memset(bb,0,sizeof(bb)); memset(ins,0,sizeof(ins)); int iMax=-1; int zero; bool flag;// ones; while(scanf("%d%d",&a,&b)) { if(a==-1 && b==-1) break; if(a==0 && b==0) { zero=0; flag = false; for(i=1;i<=iMax;++i) { if(bb[i]) { if(ins[i]==0) zero+=1; else { if(ins[i]>1) { printf("Case %d is not a tree.n",c); c++; flag=true; break; } } if(zero > 1)//度为0的点大于1个 { printf("Case %d is not a tree.n",c); c++; flag=true; break; } } } if(flag == false ) { if(zero ==0 && iMax!=-1) printf("Case %d is not a tree.n",c); else printf("Case %d is a tree.n",c); c++; } memset(bb,0,sizeof(bb)); memset(ins,0,sizeof(ins)); iMax=-1; } else { bb[a]=true; bb[b]=true; ins[b]+=1; if(iMax<a) iMax=a; if(iMax<b) iMax=b; } } return 0; }
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