CCF认证真题-(201409-2)-画图(暴力)

#include <iostream>
#include <algorithm>
#include <set>
using namespace std;

bool vis[105][105]{false};
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    int x1, y1, x2, y2, s = 0;
    for (int i = 1; i <= n; i++) {
        cin >> x1 >> y1 >> x2 >> y2;
        for (int x = x1; x < x2; x++) {
            for (int y = y1; y < y2; y++) {
                if (!vis[x][y]) {
                    s++;
                    vis[x][y] = true;
                }
            }
        }
    }
    cout << s << endl;
    return 0;
}