SPOJ Number Steps 解题报告

1112. Number Steps

Time Limit: 2s Source limit: 50000B

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...10000.

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

继续水题,而且是以前做过的,找规律即可。

CODE

program main
	integer t,x,y
	read(*,*) t
	do i=1,t
		read(*,*) x,y
		if(.not. ((x==y).or.(x-y==2))) then
			write(*,"(A9)") "No Number"
		else
			write(*,"(I0)") x+y-mod(x,2)
		endif
	enddo
end
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