24 lines
558 B
C++
24 lines
558 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e4 + 10;
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int n, sum;
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bool p[N][N];
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void paint(int x1, int y1, int x2, int y2) {
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for (int i = x1; i < x2; i++)
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for (int j = y1; j < y2; j++)
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p[i][j] = 1;
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}
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++) {
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int x1, y1, x2, y2;
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cin >> x1 >> y1 >> x2 >> y2;
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paint(x1, y1, x2, y2);
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}
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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if (p[i][j]) sum++;
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printf("%d\n", sum);
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return 0;
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}
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