50114. Simple Polygon

#include <stdio.h>
#include <stdlib.h>

typedef struct{
    int x;
    int y;
}pt;

int main(){
    pt a, b, c, d;
    scanf("%d %d %d %d %d %d %d %d", &a.x, &a.y, &b.x, &b.y, &c.x, &c.y, &d.x, &d.y);

    int area = 0;
    area += (b.x - a.x) * (b.y - a.y);
    area += (c.x - a.x) * (d.y - b.y);
    area += (c.x - d.x) * (c.y - d.y);

    int per = 0;
    per += 2 * (c.x - a.x + c.y - a.y);
    printf("%d\n%d\n", per, area);
}