Submission #837453

#	Time	Username	Problem	Language	Result	Execution time	Memory
837453		borisAngelov	Miners (IOI07_miners)	C++17	100 / 100	151 ms	134084 KiB

miners

#include <bits/stdc++.h>

using namespace std;

const int maxn = 100005;

int n;
string s;

int a[maxn];

int dp[maxn][4][4][4][4];
bool bl[maxn][4][4][4][4];

int calc(int x, int y, int z)
{
    int result = 3;

    if (y == 0 || y == x)
    {
        --result;
    }

    if (z == 0 || z == x)
    {
        --result;
    }

    if (y == z && y != x && z != x && y != 0 && z != 0)
    {
        result = 2;
    }

    return result;
}

int f(int pos, int last1, int second1, int last2, int second2)
{
    if (pos == n)
    {
        return 0;
    }

    if (bl[pos][last1][second1][last2][second2] == true)
    {
        return dp[pos][last1][second1][last2][second2];
    }

    bl[pos][last1][second1][last2][second2] = true;

    int result = calc(a[pos], last1, second1) + f(pos + 1, a[pos], last1, last2, second2);
    result = max(result, calc(a[pos], last2, second2) + f(pos + 1, last1, second1, a[pos], last2));

    return dp[pos][last1][second1][last2][second2] = result;
}

void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int main()
{
    fastIO();

    cin >> n >> s;

    for (int i = 0; i < n; ++i)
    {
        if (s[i] == 'M')
        {
            a[i] = 1;
        }

        if (s[i] == 'B')
        {
            a[i] = 2;
        }

        if (s[i] == 'F')
        {
            a[i] = 3;
        }
    }

    cout << f(0, 0, 0, 0, 0) << endl;

    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8