Submission #760106

#	Time	Username	Problem	Language	Result	Execution time	Memory
760106		Blagoj	Miners (IOI07_miners)	C++17	100 / 100	555 ms	612 KiB

miners

#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define ll long long
#define all(x) x.begin(), x.end()

inline void mx(int &u, int x) { u = max(u, x); }

int dp[4][4][4][4], cnt[4];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    string str;
    cin >> str;
    map<char, int> mp;
    mp['M'] = 1;
    mp['B'] = 2;
    mp['F'] = 3;
    int ans = 0;
    cnt[0] = 100;
    for (int i = 0; i < n; i++) {
        int dp1[4][4][4][4];
        memset(dp1, 0, sizeof(dp1));
        for (int j = 0; j <= 3; j++) {
            if (cnt[j] > 0) {
                cnt[j]--;
                for (int l = 0; l <= 3; l++) {
                    if (cnt[l] > 0) {
                        cnt[l]--;
                        set<int> s;
                        if (j != 0) s.insert(j);
                        if (l != 0) s.insert(l);
                        s.insert(mp[str[i]]);
                        for (int w = 0; w <= 3; w++) {
                            if (cnt[w] > 0) {
                                cnt[w]--;
                                for (int z = 0; z <= 3; z++) {
                                    if (cnt[z] > 0) {
                                        mx(dp1[l][mp[str[i]]][w][z],
                                           dp[j][l][w][z] + s.size());
                                    }
                                }
                                cnt[w]++;
                            }
                        }
                        cnt[l]++;
                    }
                }
                cnt[j]++;
            }
        }
        for (int w = 0; w <= 3; w++) {
            if (cnt[w] > 0) {
                cnt[w]--;
                for (int z = 0; z <= 3; z++) {
                    if (cnt[z] > 0) {
                        cnt[z]--;
                        set<int> s;
                        if (w != 0) s.insert(w);
                        if (z != 0) s.insert(z);
                        s.insert(mp[str[i]]);
                        for (int j = 0; j <= 3; j++) {
                            if (cnt[j] > 0) {
                                cnt[j]--;
                                for (int l = 0; l <= 3; l++) {
                                    if (cnt[l] > 0) {
                                        mx(dp1[j][l][z][mp[str[i]]],
                                           dp[j][l][w][z] + s.size());
                                    }
                                }
                                cnt[j]++;
                            }
                        }
                        cnt[z]++;
                    }
                }
                cnt[w]++;
            }
        }
        cnt[mp[str[i]]]++;
        for (int j = 0; j <= 3; j++) {
            for (int l = 0; l <= 3; l++) {
                for (int w = 0; w <= 3; w++) {
                    for (int z = 0; z <= 3; z++) {
                        dp[j][l][w][z] = dp1[j][l][w][z];
                        mx(ans, dp[j][l][w][z]);
                    }
                }
            }
        }
    }
    cout << ans;
}

• 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