Submission #957291

#	Time	Username	Problem	Language	Result	Execution time	Memory
957291		DeltaStruct	Linear Garden (IOI08_linear_garden)	C++17	0 / 100	416 ms	2320 KiB

linear_garden

#include <bits/stdc++.h>
using namespace std;
#define int long long
 
signed main(){
  int n,m,r=0; cin >> n >> m; string s; cin >> s;
  vector dp(5,vector(5,vector<int>(5))); auto res = dp; for (int i(0);i < 5;++i) dp[i][i][i] = 1;
  int t = 2; for (char a:s) t += (a=='L'?1:-1);
  for (int i(n-1);i > -1;--i){
    t -= (s[i]=='L'?1:-1);
    if (s[i]=='P'&&t+1<5) for (int k(0);k < 5;++k) for (int j(0);j < 5;++j) (r += dp[t+1][k][j])%=m;
    for (int u(0);u < 5;++u){
      for (int k(0);k < 5;++k) for (int j(0);j < 5;++j) res[u][k][j] = 0;
      if (u!=4) for (int k(0);k < 5;++k) for (int j(k);j < 4;++j) (res[u][min(k+1,u+1)][max(j+1,u+1)] += dp[u][k][j])%=m;
      if (u!=0) for (int k(1);k < 5;++k) for (int j(k);j < 5;++j) (res[u][min(k-1,u-1)][max(j-1,u-1)] += dp[u][k][j])%=m;
    }
    swap(dp,res);
  }
  cout << r << endl;
}

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