䁏取

include<stdio.h>//本题答案 int main() {

int x1,x2,y1,y2,x,y,d; x=0; y=0; d=0; scanf("%d %d %d %d",&x1,&y1,&x2,&y2); x=x1-x2; if(x<0){ x=-1; } y=y1-y2; if(y<0){ y=-1; } d=x+y; printf("%d",d); return 0; }