10038 - Jolly Jumpers

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
#define sz(x) int(x.size())
#define all(x) x.begin(), x.end()

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int n = 0;
    while (cin >> n, n) {
        int prev, x;
        bool jolly = 1;
        bool vis[n]{};
        for (int i = 0; i < n; i++) {
            cin >> x;
            if (i > 0) {
                vis[abs(x - prev)] = 1;
            }
            prev = x;
        }
        for (int i = 1; i < n; i++) jolly &= vis[i];
        cout << (jolly ? "Jolly" : "Not jolly") << endl;
        n = 0;
    }
}