Submission #216128

#	Time	Username	Problem	Language	Result	Execution time	Memory
216128		anmichi	Miners (IOI07_miners)	C++17	100 / 100	234 ms	1024 KiB

miners

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
template<class T>void chmax(T &a,T b){if(a<b)a=b;}
template<class T>void chmin(T &a,T b){if(a>b)a=b;}
constexpr int INF=1000000000;
int main(){
    int n,a[100010],dp[2][4][4][4][4];
    string s;
    cin>>n>>s;
    rep(i,2){
        rep(c,4){
            rep(d,4){
                rep(e,4){
                    rep(f,4){
                        dp[i][c][d][e][f]=-INF;
                    }
                }
            }
        }
    }
    dp[0][3][3][3][3]=0;
    rep(i,n){
        if(s[i]=='M')a[i]=0;
        if(s[i]=='F')a[i]=1;
        if(s[i]=='B')a[i]=2;
    }
    rep(i,n){
        rep(c,4){
            rep(d,4){
                if(c==3&&d!=3)continue;
                rep(e,4){
                    rep(f,4){
                        int x[4]={0,0,0,0},y[4]={0,0,0,0};
                        x[c]++,x[d]++,x[a[i]]++;
                        y[e]++,y[f]++,y[a[i]]++;
                        int X=0,Y=0;
                        rep(i,3){
                            X+=(bool)x[i];
                            Y+=(bool)y[i];
                        }
                        chmax(dp[(i+1)%2][a[i]][c][e][f],dp[i%2][c][d][e][f]+X);
                        chmax(dp[(i+1)%2][c][d][a[i]][e],dp[i%2][c][d][e][f]+Y);
                    }
                }
            }
        }
    }
    int ans=0;
    rep(c,4){
        rep(d,4){
            if(c==3&&d!=3)continue;
            rep(e,4){
                rep(f,4){
                    if(e==3&&f!=3)continue;
                    chmax(ans,dp[n%2][c][d][e][f]);
                }
            }
        }
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8