제출 #588267

#제출 시각아이디문제언어결과실행 시간메모리
588267Bench0310Linear Garden (IOI08_linear_garden)C++17
100 / 100
33 ms18056 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; int main() { ios::sync_with_stdio(0); cin.tie(0); int n,mod; cin >> n >> mod; auto add=[&](int a,int b)->int{return a+b-(a+b>=mod?mod:0);}; auto sub=[&](int a,int b)->int{return a-b+(a-b<0?mod:0);}; string s; cin >> s; vector<int> a(n+1,0); for(int i=1;i<=n;i++) a[i]=(s[i-1]=='P'); vector<array<int,3>> dp(n+1,{0,0,0}); dp[0]={1,1,1}; for(int i=1;i<=n;i++) { for(int j=0;j<3;j++) { for(int k=0;k<3;k++) { if(abs(j-k)==1) dp[i][j]=add(dp[i][j],dp[i-1][k]); } } } int res=1; auto mv=[&](int l,int r,int p,int c) { l=min(l,--p); if(r-l==1) res=add(res,sub(add(dp[c][0],dp[c][1]),1)); if(r-l==2) res=add(res,dp[c][p-l]); }; int l=0,r=0,p=0; for(int i=1;i<=n;i++) { if(a[i]==1) mv(l,r,p,n-i); if(a[i]==1) r=max(r,++p); else l=min(l,--p); } cout << res << "\n"; return 0; }
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