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