Submission #1022766

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022766		nmts	Linear Garden (IOI08_linear_garden)	C++17	95 / 100	153 ms	65536 KiB

linear_garden

#include <bits/stdc++.h>

#define file(name) freopen(name".inp" , " r " , stdin);freopen(name".out" , " w " , stdout)
#define faster    ios_base :: sync_with_stdio(false) ; cin.tie(0) ; cout.tie(0) ;

#define dp(i , mi , ma) dp[i][mi + 2][ma]


using namespace std;

int n , m;
string s;

int dp[1000000 - 50][3][3];

void solve()
{

    cin >> n >> m >> s;  

     for (int mi = -2; mi <= 0; ++mi)
        for (int ma = 0; ma <= 2; ++ma)
            dp(n + 1, mi, ma) = 1;

    for (int i = n; i >= 1; --i) {
        for (int mi = -2; mi <= 0; ++mi) {
            for (int ma = 0; ma <= 2; ++ma) {
                if (mi > -2) dp(i, mi, ma) += dp(i + 1, mi - 1, max(0, ma - 1));
                if (ma < 2) dp(i, mi, ma) += dp(i + 1, min(0, mi + 1), ma + 1);
                dp(i, mi, ma) %= m;
            }
        }
    }

    s = " "  + s;
    int ans = 1;
    for (int i = 1 , mi = 0 , ma = 0 ; i <= n ; ++i)
        if (s[i] == 'L') 
            {
                mi--;
                ma = max(0 , ma - 1);
            }
        else 
            {
                if (mi > -2) ans = (ans + dp(i + 1 , mi - 1 , max(mi - 1 , 0))) % m;
                ma++;
                mi = min(0 , mi + 1);
            }
    
    cout << ans << endl;

}


int32_t main()
{
    faster;
   
    solve();
    return 0;
} 

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