Submission #685228

#	Time	Username	Problem	Language	Result	Execution time	Memory
685228		stevancv	Miners (IOI07_miners)	C++14	100 / 100	412 ms	101200 KiB

miners

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e5 + 2;
const int inf = 1e9;
int dp[N][4][4][4][4], a[N];
int F(int x, int y, int z) {
    int ans = 0;
    for (int i = 1; i <= 3; i++) {
        if (i == x || i == y || i == z) ans++;
    }
    return ans;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n; cin >> n;
    string s; cin >> s;
    for (int i = 0; i < n; i++) {
        if (s[i] == 'B') a[i] = 1;
        if (s[i] == 'F') a[i] = 2;
        if (s[i] == 'M') a[i] = 3;
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 4; j++) {
            for (int k = 0; k < 4; k++) {
                for (int l = 0; l < 4; l++) {
                    for (int m = 0; m < 4; m++) {
                        dp[i][j][k][l][m] = -inf;
                    }
                }
            }
        }
    }
    dp[0][a[0]][0][0][0] = 1;
    dp[0][0][0][a[0]][0] = 1;
    for (int i = 1; i < n; i++) {
        for (int j = 0; j < 4; j++) {
            for (int k = 0; k < 4; k++) {
                for (int l = 0; l < 4; l++) {
                    for (int m = 0; m < 4; m++) {
                        smax(dp[i][a[i]][k][l][m], dp[i - 1][k][j][l][m] + F(a[i], k, j));
                        smax(dp[i][j][k][a[i]][m], dp[i - 1][j][k][m][l] + F(a[i], m, l));
                    }
                }
            }
        }
    }
    int ans = -inf;
    for (int j = 1; j < 4; j++) {
        for (int k = 0; k < 4; k++) {
            for (int l = 1; l < 4; l++) {
                for (int m = 0; m < 4; m++) {
                    smax(ans, dp[n - 1][j][k][l][m]);
                }
            }
        }
    }
    cout << ans << en;
    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