Submission #578447

#	Time	Username	Problem	Language	Result	Execution time	Memory
578447		Hacv16	Miners (IOI07_miners)	C++17	100 / 100	198 ms	122188 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], memo[MAX][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 dp(int i, int a1, int a2, int b1, int b2){
    if(i == n) return 0;

    if(memo[i][a1][a2][b1][b2] != -1)
        return memo[i][a1][a2][b1][b2];
 
    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++){
        if(s[i] == 'M') v[i] = 1;
        else if(s[i] == 'F') v[i] = 2;
        else v[i] = 3;
    }
 
    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