제출 #553466

#제출 시각아이디문제언어결과실행 시간메모리
553466AbdelmagedNourLinear Garden (IOI08_linear_garden)C++17
75 / 100
49 ms65536 KiB
#include <bits/stdc++.h> #pragma GCC optimize("Ofast") using namespace std; const int MAX=1000005; int dp[MAX][5][5][5],mod; int add(int a,int b){ return a+b-(a+b>=mod?mod:0); } int solve(int n,int mn,int mx,int d){ if(mx-mn>2)return 0; if(!n)return 1; int&ret=dp[n][mn][mx][d]; if(~ret)return ret; ret=add(solve(n-1,mn,max(mx,d+1),d+1),solve(n-1,min(mn,d-1),mx,d-1)); return ret; } void calc(int N){ for(int n=0;n<=N;n++){ for(int mn=0;mn<=2;mn++)for(int mx=2;mx<=mn+2;mx++)for(int d=mn;d<=mx;d++){ int&ret=dp[n][mn][mx][d]; if(!n)ret=1; else{ if(d+1<5)ret=dp[n-1][mn][max(mx,d+1)][d+1]; if(d-1>=0)ret=add(ret,dp[n-1][min(mn,d-1)][mx][d-1]); } } } } int index(string&s){ int mn=2,mx=2,d=2,res=0,n=s.size(); solve(n,2,2,2); for(int i=0;i<n;i++){ if(s[i]=='L'){ mn=min(mn,d-1); d--; }else{ res=add(res,solve(n-i-1,min(mn,d-1),mx,d-1)); mx=max(mx,d+1); d++; } } return add(res,1); } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); //memset(dp,-1,sizeof(dp)); int n; string s; cin>>n>>mod>>s; calc(n); cout<<index(s); return 0; }
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