1 second
256 megabytes
standard input
standard output
Gerald has n younger brothers and their number happens to be even. One day he bought n2 candy
bags. One bag has one candy, one bag has two candies, one bag has three candies and so on. In fact, for each integer k from 1 to n2 he
has exactly one bag with k candies.
Help him give n bags of candies to each brother so that all brothers got the same number of candies.
The single line contains a single integer n (n is
even, 2 ≤ n ≤ 100) — the number of Gerald's brothers.
Let's assume that Gerald indexes his brothers with numbers from 1 to n.
You need to print n lines, on the i-th
line print nintegers — the numbers of candies in the bags for the i-th
brother. Naturally, all these numbers should be distinct and be within limits from 1 to n2.
You can print the numbers in the lines in any order.
It is guaranteed that the solution exists at the given limits.
2
1 4 2 3
The sample shows Gerald's actions if he has two brothers. In this case, his bags contain 1, 2, 3 and 4 candies. He can give the bags with 1 and 4 candies to one brother and the bags with 2 and 3 to the other brother.
解题说明：此题其实就是从1到n^2这么多数字中选择n对数字，让每一对数字之和相等。最简单的是头尾配对，然后依次向内移动。
#include <cstdio>
#include<iostream>
using namespace std;
int main()
{
int n,i;
scanf("%d",&n);
for(i=1;i<=(n*n)/2;i++)
{
printf("%d %d\n",i,(n*n)-i+1);
}
return 0;
}