zoj1414 Number Steps

Number Steps

Time Limit: 2000MS Memory Limit: 65536KB 64bit IO Format: %lld & %llu

Submit Status

Description

Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,... as shown in the figure. For example, 1, 2, and 3 has been written at points (1,1), (2,0), and (3, 1) respectively and this pattern has continued.

You are to write a program that reads the coordinates of a point (x, y), and writes the number (if any) that has been written at that point. (x, y) coordinates in the input are in the range 0...5000.

Input

The first line of the input is N, the number of test cases for this problem. In each of the N following lines, there is x, and y representing the coordinates (x, y) of a point.

Output

For each point in the input, write the number written at that point or write No Number if there is none.

Sample Input

3
4 2
6 6
3 4

Sample Output

6
12
No Number

Source

Asia 2000, Tehran (Iran)

分析:

非常简单的找规律题。

ac代码：

#include <iostream>
#include<cstdio>
using namespace std;


int main()
{
    int n,x,y;
    scanf("%d",&n);
    while(n--)
    {
        scanf("%d%d",&x,&y);
        if(x==y&&x%2==0)
        printf("%d\n",x+y);
        else if(x==y&&x%2==1)
        printf("%d\n",x+y-1);
        else if(x-y==2&&x%2==1)
        printf("%d\n",x+y-1);
        else if(x-y==2&&x%2==0)
        printf("%d\n",x+y);
        else
        printf("No Number\n");
    }
    return 0;
}