Submission #578448

#	Time	Username	Problem	Language	Result	Execution time	Memory
578448		Hacv16	Miners (IOI07_miners)	C++17	100 / 100	121 ms	852 KiB

miners

#include<bits/stdc++.h>
using namespace std;
 
#define pb push_back
#define fr first
#define sc second
 
typedef long long ll;
const int MAX = 110000;
const int INF = 0x3f3f3f3f;
 
string s;
int n, v[MAX], dp[2][4][4][4][4]; //optimize memory
 
int add(int a, int b, int c){ //size of {a, b, c}
    int aux = 0;
 
    if(a) aux |= (1 << a);
    if(b) aux |= (1 << b);
    if(c) aux |= (1 << c);
 
    return __builtin_popcount(aux);
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
    cin >> n >> s;
 
    for(int i = 0; i < n; i++){
        if(s[i] == 'M') v[i] = 1;
        else if(s[i] == 'F') v[i] = 2;
        else v[i] = 3;
    }
 
    for(int i = n - 1; i >= 0; i--){
        for(int a1 = 0; a1 < 4; a1++){
            for(int a2 = 0; a2 < 4; a2++){
                for(int b1 = 0; b1 < 4; b1++){
                    for(int b2 = 0; b2 < 4; b2++){
                        int aux = i % 2, m1 = add(v[i], a1, a2), m2 = add(v[i], b1, b2);

                        int &ans = dp[aux][a1][a2][b1][b2];

                        if(i == n - 1){
                            ans = max(m1, m1);
                        }else{
                            ans = max(m1 + dp[!aux][v[i]][a1][b1][b2], m2 + dp[!aux][a1][a2][v[i]][b1]);
                        }
                    }
                }
            }
        }
    }

    cout << dp[0][0][0][0][0] << '\n';
 
    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