为什么编译错误？？

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using db=double;
using ull = unsigned long long;
const ll INF=9223372036854775807;
const int inf=2147483647;
const int N=2e5+5;
int x1[N],y1[N],x2[N],y2[N];
int n; 
int main() {
	//	freopen("123.in","r",stdin);
    //	freopen("123.out","w,",stdout);
    int mi_x=inf,ma_x=-inf,mi_y=inf,ma_y=-inf;
    cin>>n;
    for(int i=1;i<=n;i++){
    	cin>>x1[i]>>y1[i]>>x2[i]>>y2[i];
    	mi_x=min(mi_x,x1[i]);
        mi_y=min(mi_y,y1[i]);
        ma_x=max(ma_x,x2[i]);
        ma_y=max(ma_y,y2[i]);
	}
	ll ans=1LL*(ma_x-mi_x)*(ma_y-mi_y);
	cout<<ans<<endl;
	return 0;
}