hdu2578Dating with girls(1)
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题目大意:
呵呵。。。。它说输入的是正整数,结果测试数据里面有0.。。。
解题思路:
直接上代码了,其实我是想计算小于等于K/2的。。。。
#include<stdio.h>#include<algorithm>#define N 100010using namespace std;int main(){ int n,i,j,t,ans; int m,right,left,mid,a[N],cur; scanf("%d",&t); while(t--){ scanf("%d %d",&n,&m); for(i=0;i<n;i++){ scanf("%d",&a[i]);// if(a[i]==0) 当AC之后看看测试数据到底有没有零// break; } sort(a,a+n); ans=0; for(i=0;i<n;i++) { cur=m-a[i]; left=0;right=n-1; if(i==0||a[i]!=a[i-1]) while(left<=right) { mid=(left+right)/2; if(a[mid]==cur){ ans+=1; break; } else if(a[mid]<cur) left=mid+1; else right=mid-1; } } printf("%d\n",ans); }}
0 0
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