Background
One day, an ant called Alice came to an M*M chessboard. She wanted to go around all the grids. So she began to walk along the chessboard according to this way: (you can assume that her speed is one grid per second)
At the first second, Alice was standing at (1,1). Firstly she went up for a grid, then a grid to the right, a grid downward. After that, she went a grid to the right, then two grids upward, and then two grids to the left¡in a word, the path was like a snake.
For example, her first 25 seconds went like this:
( the numbers in the grids stands for the time when she went into the grids)
25 | 24 | 23 | 22 | 21 |
10 | 11 | 12 | 13 | 20 |
9 | 8 | 7 | 14 | 19 |
2 | 3 | 6 | 15 | 18 |
1 | 4 | 5 | 16 | 17 |
5
4
3
2
1
1 2 3 4 5
At the 8th second , she was at (2,3), and at 20th second, she was at (5,4).
Your task is to decide where she was at a given time.
(you can assume that M is large enough)
Input
Input file will contain several lines, and each line contains a number N(1<=N<=2*10^9), which stands for the time. The file will be ended with a line that contains a number 0.
Output
For each input situation you should print a line with two numbers (x, y), the column and the row number, there must be only a space between them.
Sample Input
8
20
25
0
Sample Output
2 3
5 4
1 5
找到规律就可以了。
#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
using namespace std;
int main()
{
int n;
while(scanf("%d",&n)!=EOF)
{
if(n == 0)
{
break;
}
int x,y,t;
int m;
m = sqrt(n);
if(m * m < n)
{
m++;
}
t = n - (m*m-m+1);
//printf("m = %d t = %d\n",m,t);
if(m%2 == 0)
{
if(t>0)
{
x = m;
y = m - t;
}
else
{
x = m + t;
y = m;
}
}
else
{
if(t>0)
{
x = m - t;
y = m;
}
else
{
x = m;
y = m + t;
}
}
printf("%d %d\n",x,y);
}
return 0;
}