题解 | 绕距

#include <stdio.h>
#include<math.h>
int main() {
    int x1 = 0, y1 = 0,x2 = 0,y2 = 0;
    
    float circumference;
    scanf("%d %d",&x1,&y1);
    scanf("%d %d",&x2,&y2);
    float euclidean_distance =sqrt((x1 - x2)*(x1 - x2)+(y1 - y2)*(y1 - y2));
    float manhattan_distance = abs(x1-x2)+abs(y1-y2);
     circumference = euclidean_distance - manhattan_distance;
       printf("%f",fabs(circumference));
   
    return 0;
}