OJ-Problems-Source/HDOJ/2478_autoAC.cpp
2016-08-22 00:16:58 +08:00

90 lines
2.3 KiB
C++

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
const int N=100010;
const int L=-1000001;
const int R=1000001;
int x1[N], x2[N], y1[N], y2[N];
int main()
{
int tcase;
while (~scanf("%d",&tcase))
{
while (tcase--)
{
int n;
scanf("%d", &n);
int lx = L, ly = L, rx = R, ry = R;
int lx1 = L, ly1 = L, rx1 = R, ry1 = R;
for (int i = 0; i < n; i++)
{
scanf("%d%d%d%d", &x1[i], &y1[i], &x2[i], &y2[i]);
if (x1[i] > lx)
{
lx1 = lx;
lx = x1[i];
}
else if (x1[i] > lx1)
lx1 = x1[i];
if (y1[i] > ly)
{
ly1 = ly;
ly = y1[i];
}
else if (y1[i] > ly1)
ly1 = y1[i];
if (x2[i] < rx)
{
rx1 = rx;
rx = x2[i];
}
else if (x2[i] < rx1)
rx1 = x2[i];
if (y2[i] < ry)
{
ry1 = ry;
ry = y2[i];
}
else if (y2[i] < ry1)
ry1 = y2[i];
}
if (n==1)
{
printf("0\n");
continue;
}
int ans = 0;
int x,y;
int xx,yy;
for (int i = 0; i < n; i++)
{
if (x1[i] == lx)
x = lx1;
else
x = lx;
if (y1[i] == ly)
y = ly1;
else
y = ly;
if (x2[i] == rx)
xx = rx1;
else
xx = rx;
if (y2[i] == ry)
yy = ry1;
else
yy = ry;
if (yy > y && xx > x)
{
int tmp = (yy - y)*(xx - x);
if (tmp > ans)
ans = tmp;
}
}
printf("%d\n",ans);
}
}
return 0;
}