//斜率计算
#include<stdio.h>
int main(){
int x1,x2,y1,y2,k;
scanf("%d%d\n%d%d",&x1,&y1,&x2,&y2);
if(x2-x1 == 0)
printf("INF");
else{
k = (y2-y1)/(x2-x1);
printf("%d",k);
}
return 0;
}
原文：https://www.cnblogs.com/Hqx-curiosity/p/12241834.html