A. Easy Math

Time Limit: 2000ms

Memory Limit: 65536KB

Given n integers a1,a2,…,an, check if the sum of their square root a1−−√+a2−−√+⋯+an−−√ is a integer.

Input

The input consists of multiple tests. For each test:

The first line contains 1 integer n (1≤n≤105).

The second line contains n integers a1,a2,…,an (0≤ai≤109).

Output

For each test, write ‘‘Yes′′ if the sum is a integer, or ‘‘No′′ otherwise.

Sample Input

2

1 4

2

2 3

Sample Output

Yes

No

判断每一个数是不是平方数,如果不是平方数,最后的结果不是整数

#include <bits/stdc++.h>

#define LL long long

#define fread() freopen("in.in","r",stdin)

#define fwrite() freopen("out.out","w",stdout)

using namespace std;

int main()

{

    int n,data;

    while(~scanf("%d",&n))

    {

        bool flag=false;

        while(n--)

        {

            scanf("%d",&data);

            if(flag)

            {

                continue;

            }

            int ans=(int)sqrt(data);

            if(ans*ans!=data)//判断是不是平方数

            {

                flag=true;

            }

        }

        if(flag)

        {

            cout<<"No"<<endl;

        }

        else

        {

            cout<<"Yes"<<endl;

        }

    }

    return 0;

}