Submission #1185872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185872		enzy	Miners (IOI07_miners)	C++20	100 / 100	65 ms	584 KiB

miners

#include <bits/stdc++.h>
using namespace std;
const int maxn=1e5+1;
const int inf=1e9+7;
int v[maxn], dp[2][4][4][4][4]; // quais eram os ultimos dois ativos de cada mina
int main()
{
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int n; cin >> n;
    for(int i=1;i<=n;i++){
        char c; cin >> c;
        if(c=='M') v[i]=1;
        if(c=='B') v[i]=2;
        if(c=='F') v[i]=3;
    }
    for(int i=0;i<=1;i++)
        for(int i1=0;i1<=3;i1++)
            for(int i2=0;i2<=3;i2++)
                for(int j1=0;j1<=3;j1++)
                    for(int j2=0;j2<=3;j2++) 
                        dp[i][i1][i2][j1][j2]=-inf;
    dp[0][0][0][0][0]=0;
    int resp=0;
    for(int i=1;i<=n;i++)
        for(int i1=0;i1<=3;i1++)
            for(int i2=0;i2<=3;i2++)
                for(int j1=0;j1<=3;j1++)
                    for(int j2=0;j2<=3;j2++){
                        int j=i%2;
                        int t1=3, t2=3;
                        if(!i1||!i2) t1--;
                        if(!j1||!j2) t2--;
                        if(i1==v[i]||i1==i2) t1--;
                        if(j1==v[i]||j1==j2) t2--;
                        if(v[i]==i2) t1--;
                        if(v[i]==j2) t2--;
                        dp[j][i2][v[i]][j1][j2]=max(dp[((j+1)%2)][i1][i2][j1][j2]+t1,dp[j][i2][v[i]][j1][j2]);
                        dp[j][i1][i2][j2][v[i]]=max(dp[((j+1)%2)][i1][i2][j1][j2]+t2,dp[j][i1][i2][j2][v[i]]);
                        resp=max({resp,dp[j][i2][v[i]][j1][j2],dp[j][i1][i2][j2][v[i]]});
                    }
    cout << resp << 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