Submission #411665

#TimeUsernameProblemLanguageResultExecution timeMemory
411665JasiekstrzMiners (IOI07_miners)C++17
100 / 100
383 ms100808 KiB
#include<bits/stdc++.h> #define fi first #define se second using namespace std; const int N=1e5; const int INF=1e9+7; int dp[N+10][4][4][4][4]; int f(int a,int b,int c) { int ans=0; bool cc[4]={0,0,0,0}; for(int i:{a,b,c}) { if(i!=0 && !cc[i]) ans++; cc[i]=true; } return ans; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); int n; string s; cin>>n>>s; for(int i=0;i<=n;i++) { for(int a=0;a<4;a++) { for(int b=0;b<4;b++) { for(int c=0;c<4;c++) { for(int d=0;d<4;d++) { dp[i][a][b][c][d]=-INF; } } } } } dp[0][0][0][0][0]=0; for(int i=0;i<n;i++) { int x; if(s[i]=='M') x=1; else if(s[i]=='F') x=2; else x=3; for(int a=0;a<4;a++) { for(int b=0;b<4;b++) { for(int c=0;c<4;c++) { for(int d=0;d<4;d++) { dp[i+1][a][b][d][x]=max(dp[i+1][a][b][d][x],dp[i][a][b][c][d]+f(c,d,x)); dp[i+1][b][x][c][d]=max(dp[i+1][b][x][c][d],dp[i][a][b][c][d]+f(a,b,x)); } } } } } int ans=0; for(int a=0;a<4;a++) { for(int b=0;b<4;b++) { for(int c=0;c<4;c++) { for(int d=0;d<4;d++) { ans=max(ans,dp[n][a][b][c][d]); } } } } cout<<ans<<"\n"; return 0; }
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