Submission #805721

#	Time	Username	Problem	Language	Result	Execution time	Memory
805721		handlewastaken	Linear Garden (IOI08_linear_garden)	C++17	80 / 100	42 ms	4200 KiB

linear_garden

#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;
int main()
{
    ll n, m, i, s = 1, df = 0, odf;
    cin >> n >> m;
    char ch;
    bool a, b, c, x, y, z;
    a = b = c = true;
    vector<ll> po(n / 2 + 1);
    po[0] = 1;
    for (i = 1; i <= n / 2; i++)
        po[i] = (2 * po[i - 1]) % m;
    while (n--)
    {
        cin >> ch;
        odf = df;
        if (ch == 'P')
        {
            odf--;
            df++;
            x = a;
            y = b;
            z = c;
            if (odf < -2 || odf > 2)
                continue;
            if (odf < 0)
                z = false;
            if (odf > 0)
                x = false;
            if (odf == 2 || odf == -2)
                y = false;
            if (x || z)
            {
                s += po[n / 2];
                if (y)
                    s--;
            }
            if (y)
                s += po[(n + 1) / 2];
            s %= m;
        }
        else
            df--;
        x = a;
        y = b;
        z = c;
        if (df < 0)
            c = false;
        if (df > 0)
            a = false;
        if (df == 2 || df == -2)
            b = false;
    }
    cout << ((s % m) + m) % m;
    return 0;
}

• Subtask 1: 2 / 2
• Subtask 2: 2 / 2
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 4 / 4
• Subtask 7: 4 / 4
• Subtask 8: 4 / 4
• Subtask 9: 4 / 4
• Subtask 10: 4 / 4
• Subtask 11: 4 / 4
• Subtask 12: 5 / 5
• Subtask 13: 0 / 5
• Subtask 14: 0 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 0 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5
• Subtask 21: 5 / 5
• Subtask 22: 5 / 5
• Subtask 23: 0 / 5