제출 #839259

#제출 시각아이디문제언어결과실행 시간메모리
839259AndrijaMMiners (IOI07_miners)C++14
100 / 100
827 ms149868 KiB
#include<bits/stdc++.h> using namespace std; typedef int ll; const int maxn=1e5 + 10; int di[4]={1,-1,0,0}; int dj[4]={0,0,-1,1}; int n; string s; int dp[maxn][4][4][4][4]; int f(int idx,int a,int b,int c,int d) { if(idx==n) { return 0; } if(dp[idx][a][b][c][d]!=-1)return dp[idx][a][b][c][d]; int rez=0; int x=0; if(s[idx]=='M') { x=1; } else if(s[idx]=='F') { x=2; } else { x=3; } set<int>se1; se1.insert(a); se1.insert(b); se1.insert(x); set<int>se2; se2.insert(c); se2.insert(d); se2.insert(x); int num=se1.size(); if(a==0 || b==0) { num--; } rez=max(rez, f(idx+1,b,x,c,d)+num); num=se2.size(); if(c==0 || d==0) { num--; } rez=max(rez, f(idx+1,a,b,d,x)+num); return dp[idx][a][b][c][d]=rez; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cin>>n>>s; memset(dp,-1,sizeof dp); cout<<f(0,0,0,0,0)<<endl; return 0; }
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