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BORW - Black or White



#include <iostream>
#include <cstring>

using namespace std;

typedef long int li;

const int size = 201;
int n;
li arr[size];

int dp[size][size][size];

int main()
{
    while(true)
    {
        cin >> n;

        if(n == -1)
            break;

        for(int i = 1; i <= n; i++)
            cin >> arr[i];

        memset(dp, 0, sizeof(dp));

        for(int i = 1; i <= n; i++)
        {
            for(int lb = i + 1; lb <= n + 1; lb++)
            {
                for(int lw = i + 1; lw <= n + 1; lw++)
                {
                    dp[i][lb][lw] = dp[i - 1][lb][lw] + 1;

                    if(lb > n || arr[i] < arr[lb])
                    {
                        dp[i][lb][lw] = min(dp[i][lb][lw], dp[i - 1][i][lw]);
                    }

                    if(lw > n || arr[i] > arr[lw])
                    {
                        dp[i][lb][lw] = min(dp[i][lb][lw], dp[i - 1][lb][i]);
                    }
                }
            }
        }

        cout << dp[n][n + 1][n + 1] << endl;
    }
    return 0;
}

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