題目描述
輸入
輸出
示例輸入
4 1 3 5 8 3
示例輸出
YES
代碼:
#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
int cmp(int x,int y)
{
return x<y;
}
int bsearch(int* b,int x,int y,int v)
{
int m;
while(x<y)
{
m=x+(y-x)/2;
if(b[m]==v) return m;
else if(b[m]>v) y=m;
else x=m+1;
}
return -1;
}
int main()
{
int n,a[100001],m,count ;
while(scanf("%d",&n)!=EOF)
{ count =0;
memset(a,0,sizeof(a));
for(int i=0;i<n;i++)
scanf("%d",&a[i]);
//sort(a,a+n,cmp);
scanf("%d",&m);
count =bsearch(a,0,n-1,m);
if(count!=-1) printf("YES\n");
else printf("NO\n");
}
return 0;
}