Submission #739590

#	Time	Username	Problem	Language	Result	Execution time	Memory
739590		Toxtaq	Miners (IOI07_miners)	C++17	100 / 100	1374 ms	424648 KiB

miners

#include<bits/stdc++.h>
using namespace std;
int n;
string s; /// M-1, B-2, F-3
map<char, int>mp;

long long table[100001][2][4][4][4][4];
long long rec(int indx, int mine, int last11, int last12, int last21, int last22){
    vector<int>v(4);
    v[0] = last11;
    v[1] = last12;
    v[2] = last21;
    v[3] = last22;
    long long res = 0;
    int cnt = 0;
    vector<int>tempo(4);
    if(indx == n)return 0;
    if(table[indx][mine][last11][last12][last21][last22] != -1e18)return table[indx][mine][last11][last12][last21][last22];
    if(mine == 1){
        if(last11 != 0){
            tempo[last11]++;
            cnt++;
        }
        if(last12 != 0){
            if(!tempo[last12])cnt++;
            tempo[last12]++;
        }
        last12 = last11;
        last11 = mp[s[indx]];
    }
    else{
        if(last21 != 0){
            tempo[last21]++;
            cnt++;
        }
        if(last22 != 0){
            if(!tempo[last22])cnt++;
            tempo[last22]++;
        }
        last22 = last21;
        last21 = mp[s[indx]];
    }
    if(!tempo[mp[s[indx]]])cnt++;
    res = cnt + max(rec(indx + 1, 1, last11, last12, last21, last22), rec(indx + 1, 2, last11, last12, last21, last22));
    return table[indx][mine][v[0]][v[1]][v[2]][v[3]] = res;
}
int main()
{
    cin >> n >> s;
    mp['M'] = 1;
    mp['B'] = 2;
    mp['F'] = 3;
    for(int i = 0;i < n;++i){
        for(int j = 0;j < 2;++j){
            for(int l = 0;l < 4;++l){
                for(int r = 0;r < 4;++r){
                    for(int k = 0;k < 4;++k){
                        for(int z = 0;z < 4;++z){
                            table[i][j][l][r][k][z] = -1e18;
                        }
                    }
                }
            }
        }
    }
    cout << max(rec(0, 1, 0, 0, 0, 0), rec(0, 2, 0, 0, 0, 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