Submission #1020501

#TimeUsernameProblemLanguageResultExecution timeMemory
1020501boyliguanhanLinear Garden (IOI08_linear_garden)C++17
100 / 100
34 ms10988 KiB
#include<bits/stdc++.h> using namespace std; vector<pair<int,int>>v; int main(){ cin.tie(0)->sync_with_stdio(0); int n,m; cin>>n>>m; string str; cin>>str; int A=0,B=0; for(auto i:str) { if(i=='P'){ v.push_back({A+1,max(1,B)-1}); } else v.push_back({3,3}); if(i=='L') A++,B=max(1,B)-1; else B++,A=max(1,A)-1; } reverse(v.begin(),v.end()); int dp[4][4]{},dp2[4][4]{}; long long ans=1; dp[0][0]=1; for(auto[a,b]:v){ for(int i=0;i<3;i++) for(int j=0;j<3;j++) if(i+a<3&&j+b<3) ans+=dp[i][j]; for(int i=0;i<3;i++) for(int j=0;j<3;j++) dp2[i+1][max(j-1,0)]+=dp[i][j], dp2[max(i-1,0)][j+1]+=dp[i][j]; for(int i=0;i<3;i++) for(int j=0;j<3;j++) dp[i][j]=dp2[i][j]%m,dp2[i][j]=0; } cout<<ans%m; }
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