Submission #995835

#	Time	Username	Problem	Language	Result	Execution time	Memory
995835		biank	Linear Garden (IOI08_linear_garden)	C++14	0 / 100	64 ms	65536 KiB

linear_garden

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1e6;

int memo[MAX_N][5][5][5][2];
int n, m;
string g;

int dp(int pos, int curr_diff = 2, int min_diff = 2, int max_diff = 2, bool tight = 1) {
    if (curr_diff < 0 || curr_diff >= 5) return 0;
    if (max_diff - min_diff >= 3) return 0;
    if (pos == n) return 1;
    int &res = memo[pos][curr_diff][min_diff][max_diff][tight];
    if (res != -1) return res;
    res = dp(pos + 1, curr_diff + 1, min_diff, max(max_diff, curr_diff + 1), tight && g[pos] == 'L');
    if (!tight || g[pos] == 'P') {
        res += dp(pos + 1, curr_diff - 1, min(min_diff, curr_diff - 1), max_diff, tight && g[pos] == 'P');
        if (res >= m) res -= m;
    }
    return res;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    cin >> n >> m >> g;
    memset(memo, -1, sizeof memo);
    cout << dp(0) << '\n';
    
    return 0;
}

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