【HDOJ】2056 Rectangles

水题，比较烦，搞清楚计算公式即可。

#include <stdio.h>

double mymax(double a, double b) {
    return a>b ? a:b;
}

double mymin(double a, double b) {
    return a<b ? a:b;
}


int main() {
    double x1,y1,x2,y2;
    double x3,y3,x4,y4;
    double tmp;

    while (scanf("%lf%lf%lf%lf%lf%lf%lf%lf", &x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4) != EOF){
        tmp = mymax(x1, x2);
        x1 = x1+x2-tmp;
        x2 = tmp;
        tmp = mymax(x3, x4);
        x3 = x3+x4-tmp;
        x4 = tmp;
        tmp = mymax(y1, y2);
        y1 = y1+y2-tmp;
        y2 = tmp;
        tmp = mymax(y3, y4);
        y3 = y3+y4-tmp;
        y4 = tmp;

        x1 = mymax(x1, x3);
        x2 = mymin(x2, x4);
        y1 = mymax(y1, y3);
        y2 = mymin(y2, y4);
        tmp = (x2-x1) * (y2-y1);
        if(x2>=x1 && y2>=y1)
            printf("%.2lf\n",tmp);
        else
            printf("0.00\n");
    }

    return 0;
}