This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
#include <utility>
#include <map>
#include <algorithm>
using namespace std;
typedef pair<int,int> pi;
int x[2505], y[2505], hole[2505], n;
map<pi,int> mp;
int h;
int f(int s, int e){
if(s >= e) return 0;
int pos = (int)(min_element(y+s,y+e)-y);
int ret = 0;
if(hole[pos] == 0) ret += (x[e] - x[s]) * (y[pos] - h);
int ph = h;
h = y[pos];
ret += f(s,pos) + f(pos+1,e);
h = ph;
return ret;
}
int main(){
scanf("%d",&n);
n/=2;
for (int i=0; i<n; i++) {
int p,q;
scanf("%d %d %d %d",&p,&q,&x[i],&y[i]);
mp[pi(x[i],y[i])] = i;
}
int t;
scanf("%d",&t);
for (int i=0; i<t; i++) {
int s,e,x,y;
scanf("%d %d %d %d",&s,&e,&x,&y);
hole[mp[pi(s,e)]] = 1;
}
printf("%d",f(0,n-1));
}
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