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PERMUT2

PERMUT2 - Ambiguous Permutations


#include <iostream>

#define REP(i, n) for(int i = 0; i < n; i++)

using namespace std;

const int maxSize = 100001;

int arr[maxSize];
int a[maxSize];

int main()
{
    int n, pos;
    bool flag;

    while(true)
    {
        cin >> n;

        if(n == 0)
            break;

        pos = 1;
        flag = true;

        REP(i, n)
        {
            cin >> arr[i];
            a[arr[i] - 1] = pos;
            pos++;
        }

        REP(i, n)
        {
            if(a[i] != arr[i])
            {
                flag = false;
                break;
            }
        }

        if(!flag)
        {
            cout << "not ambiguous\n";
        }
        else
        {
            cout << "ambiguous\n";
        }




    }
    return 0;
}

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