一、Problem
-1010 1010
二、Solution
方法一:规律
每 4*i 轮,纵坐标增量为 2 × i,横坐标增量为 -2 × i (i > 0)
...
方法二:枚举
import java.util.*;
import java.math.*;
import java.io.*;
public class Main{
static class Solution {
void init() {
Scanner sc = new Scanner(new BufferedInputStream(System.in));
int ex = 0, ey = 0;
for (int i = 1; i <= 2020; i++) {
if (i % 4 == 1) ex+=i;
if (i % 4 == 2) ey-=i;
if (i % 4 == 3) ex-=i;
if (i % 4 == 0) ey+=i;
}
System.out.println(ex + " " + ey);
}
}
public static void main(String[] args) throws IOException {
Solution s = new Solution();
s.init();
}
}