Submission #502884

#	Time	Username	Problem	Language	Result	Execution time	Memory
502884		tabr	Miners (IOI07_miners)	C++17	100 / 100	482 ms	508 KiB

miners

#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    string s;
    cin >> s;
    const int inf = (int) 1e9;
    vector dp(4, vector(4, vector(4, vector<int>(4, -inf))));
    dp[0][0][0][0] = 0;
    for (int id = 0; id < n; id++) {
        vector new_dp(4, vector(4, vector(4, vector<int>(4, -inf))));
        int x = (s[id] == 'M' ? 1 : (s[id] == 'F' ? 2 : 3));
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                for (int k = 0; k < 4; k++) {
                    for (int l = 0; l < 4; l++) {
                        int c = 0;
                        c |= 1 << x;
                        c |= 1 << i;
                        c |= 1 << j;
                        c &= ~1;
                        new_dp[x][i][k][l] = max(new_dp[x][i][k][l], dp[i][j][k][l] + __builtin_popcount(c));
                        c = 0;
                        c |= 1 << x;
                        c |= 1 << k;
                        c |= 1 << l;
                        c &= ~1;
                        new_dp[i][j][x][k] = max(new_dp[i][j][x][k], dp[i][j][k][l] + __builtin_popcount(c));
                    }
                }
            }
        }
        swap(dp, new_dp);
    }
    int ans = 0;
    for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 4; j++) {
            for (int k = 0; k < 4; k++) {
                for (int l = 0; l < 4; l++) {
                    ans = max(ans, dp[i][j][k][l]);
                }
            }
        }
    }
    cout << ans << '\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