题解 | 至

#include <bits/stdc++.h>
using namespace std;

int main() {int n, x1, y1, x2, y2;
    cin >> n >> x1 >> y1 >> x2 >> y2;
    int A1 = (n - y1) + (2 - x1);
    int A2 = (n - y2) + (2 - x2);
    if (A1 == A2) {
        cout << "YES" << endl;
        return 0;
    }
    if ((A1 - A2) % 2 != 0) {
        cout << "NO" << endl;
        return 0;
    }
    if (x1 == x2) {
        cout << "NO" << endl;
        return 0;
    }
    int x_low, y_low;
    if (A1 < A2) {
        x_low = x1;
        y_low = y1;
    } else {
        x_low = x2;
        y_low = y2;
    }
    if (x_low == 2) {
        if (n - y_low >= 2) cout << "YES" << endl;
        else cout << "NO" << endl;
    } else { 
        if (n - y_low >= 3) cout << "YES" << endl;
        else cout << "NO" << endl;
    }
    return 0;
}