NOIP 2011 Day1 Problem1

#include<cstdio>struct node{    int start_x;    int start_y;    int end_x;    int end_y;}a[10010];int main(){    freopen("carpet.in","r",stdin);    freopen("carpet.out","w",stdout);    int n;    scanf("%d",&n);    for(int i=1;i<=n;i++)    {        int x,y;        scanf("%d %d %d %d",&a[i].start_x,&a[i].start_y,&x,&y);        a[i].end_x=a[i].start_x+x;        a[i].end_y=a[i].start_y+y;    }    int x,y;    scanf("%d %d",&x,&y);    int now=-1;    for(int i=1;i<=n;i++)        if(x>=a[i].start_x && x<=a[i].end_x && y>=a[i].start_y && y<=a[i].end_y)            now=i;    printf("%d",now);    return 0;}