USACO2016 Jan Bronze 1:Promotion Counting

#include<stdio.h>#include<stdlib.h>int sum[10000],ans[10000],x[100001],y[100001];int main(){int n=4,m,k,j,i;for(i=1;i<=4;i++){scanf("%d%d",&y[i],&x[i]);}for(i=n;i>=2;i--){sum[i]=x[i]-y[i]+ans[i];ans[i-1]=x[i]-y[i]+ans[i];}for(i=2;i<=n;i++)printf("%d\n",sum[i]);return 0;}