问题传送门：https://vjudge.net/contest/320779#problem/D
介绍一个名词：奇偶数列法则
Key part:
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
#define ll long long
int main()
{
int t;
ll a,b,c,n;
scanf("%d",&t);
while(t--)
{
scanf("%lld%lld",&n,&a);
if(n>2 || n==0) printf("-1 -1
");
else if(n==1) printf("1 %lld
",a+1);
else //an equation:a^2+b^2=c^2,we know a,find b,c?
{ //a=2*m--->b=m^2-1,c=m^2+1
ll m=a/2; //a=2*m+1--->b=2*m*(m+1),c=2*m*(m+1)+1 m>=1
if(a&1)
{
b=2*m*(m+1);
c=2*m*(m+1)+1;
}
else
{
b=m*m-1;
c=m*m+1;
}
printf("%lld %lld
",b,c);
}
}
}