Codeforces 459A Pashmak and Garden(水题)

题目链接：Codeforces 459A Pashmak and Garden

题目大意：给定两点，确定正方形，多种方案输出一种即可。不行输出-1.

解题思路：给定点无非三种情况。分类讨论即可。

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>

using namespace std;

int x1, x2, y1, y2;
int x3, x4, y3, y4;

bool judge () {
    if (x1 != x2 && y1 != y2) {
        if (abs(x1-x2) != abs(y1-y2))
            return false;

        x3 = x1; y3 = y2;
        x4 = x2; y4 = y1;
        return true;
    } else if (y1 != y2) {
        int d = abs(y1-y2);
        x3 = x1 + d; y3 = y1;
        x4 = x1 + d; y4 = y2;
        return true;
    } else if (x1 != x2) {
        int d = abs(x1-x2);
        x3 = x1; y3 = y1 + d;
        x4 = x2; y4 = y2 + d;
        return true;
    }
    return false;
}

int main () {
    scanf("%d%d%d%d", &x1, &y1, &x2, &y2);

    if (judge())
        printf("%d %d %d %d\n", x3, y3, x4, y4);
    else
        printf("-1\n");
    return 0;
}