妈蛋wa了两次。。
时尚的定义是length大于1的要破个洞,一定要破个洞。。
According to rules of the Berland fashion, a jacket should be fastened by all the buttons except only one
#include <bits/stdc++.h>
using namespace std;
typedef __int64 LL;
const int N=1e3+10;
int a[N];
int n,sum;
int main()
{
scanf("%d",&n);
for(int i=1;i<=n;i++)
scanf("%d",&a[i]);
if(n==1)
{
if(a[1]==1)
puts("YES");
else
puts("NO");
return 0;
}
sum=0;
for(int i=1;i<=n;i++)
if(!a[i])
sum++;
if(sum!=1)
puts("NO");
else
puts("YES");
return 0;
}