Submission #578072

#	Time	Username	Problem	Language	Result	Execution time	Memory
578072		Hacv16	Miners (IOI07_miners)	C++17	45 / 100	2 ms	1032 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 = 25;
const int INF = 0x3f3f3f3f;

string s;
int n, v[MAX], memo[MAX][5][5][5][5]; //optimize memory

int f(char c){
    if(c == 'M') return 1;
    else if(c == 'F') return 2;
    return 3;
}

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 dp(int i, int a1, int a2, int b1, int b2){
    if(memo[i][a1][a2][b1][b2] != -1)
        return memo[i][a1][a2][b1][b2];

    if(i == n + 1) return 0;

    int cur = -INF;

    cur = max(cur, dp(i + 1, v[i], a1, b1, b2) + add(v[i], a1, a2));
    cur = max(cur, dp(i + 1, a1, a2, v[i], b1) + add(v[i], b1, b2));

    return memo[i][a1][a2][b1][b2] = cur;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    memset(memo, -1, sizeof(memo));

    cin >> n >> s;

    for(int i = 0; i < n; i++)
        v[i + 1] = f(s[i]);

    cout << dp(1, 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: 0 / 7
• Subtask 7: 0 / 8
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8