2012 ACM/ICPC Asia Regional Changchun Online-1006
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//一个题意不清的水题,水过了,不说什么了
//代码如下:
#include<stdio.h>int sta[1100];int main(){ int n,i,sp,j,flag,t; while(scanf("%d",&n)!=EOF) { for(i=1;i<=n;i++) scanf("%d",&sta[i]); if(n&1)flag=0; else { flag=1; for(i=1;i<=n;i++) { t=0; if(sta[i]<0)t=1; for(j=i+1,sp=0;sta[i]>=0&&j<=n&&sp<5;j++) { if(sta[j]>=0&&sta[j]==sta[i]) { sta[j]=-1; sta[i]=-1; t=1; break; } else if(sta[j]>=0)sp++; } if(!t){ flag=0; break; } } } printf("%d\n",flag); } return 0;}
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