Submission #253784

#	Time	Username	Problem	Language	Result	Execution time	Memory
253784		yanndev	Miners (IOI07_miners)	C++17	100 / 100	1219 ms	100856 KiB

miners

#include <iostream>
#include <set>
#include <map>

const int MAX_FOOD = 1e5 + 1;
const int NO_FOOD = 0;
const int INF = 1e9;

int dp[MAX_FOOD][4][4][4][4];
std::map<char, int> foodToInt {{'F', 1}, {'M', 2}, {'B', 3}};

int score(int a, int b, int c) {
    std::set<int> vals {a, b, c};
    vals.erase(0);
    return vals.size();
}

int main() {
    int n_delivery;
    int ans = 0;
    std::string deliveries;
    std::cin >> n_delivery >> deliveries;

    for (int i = 0; i <= n_delivery; i++)
        for (int lastFoodM11 = 0; lastFoodM11 < 4; lastFoodM11++)
            for (int lastFoodM12 = 0; lastFoodM12 < 4; lastFoodM12++)
                for (int lastFoodM21 = 0; lastFoodM21 < 4; lastFoodM21++)
                    for (int lastFoodM22 = 0; lastFoodM22 < 4; lastFoodM22++)
                        dp[i][lastFoodM11][lastFoodM12][lastFoodM21][lastFoodM22] = -INF;

    dp[0][NO_FOOD][NO_FOOD][NO_FOOD][NO_FOOD] = 0;

    for (int i = 0; i < n_delivery; i++) {
        int curFood = foodToInt[deliveries[i]];
        for (int lastFoodM11 = 0; lastFoodM11 < 4; lastFoodM11++)
            for (int lastFoodM12 = 0; lastFoodM12 < 4; lastFoodM12++)
                for (int lastFoodM21 = 0; lastFoodM21 < 4; lastFoodM21++)
                    for (int lastFoodM22 = 0; lastFoodM22 < 4; lastFoodM22++)
                        if (dp[i][lastFoodM11][lastFoodM12][lastFoodM21][lastFoodM22] != -INF) {

                            dp[i + 1][lastFoodM12][curFood][lastFoodM21][lastFoodM22] = std::max(
                                    dp[i + 1][lastFoodM12][curFood][lastFoodM21][lastFoodM22],
                                    dp[i][lastFoodM11][lastFoodM12][lastFoodM21][lastFoodM22] +
                                    score(lastFoodM11, lastFoodM12, curFood)
                                    );

                            dp[i + 1][lastFoodM11][lastFoodM12][lastFoodM22][curFood] = std::max(
                                    dp[i + 1][lastFoodM11][lastFoodM12][lastFoodM22][curFood],
                                    dp[i][lastFoodM11][lastFoodM12][lastFoodM21][lastFoodM22] +
                                    score(lastFoodM21, lastFoodM22, curFood)
                                    );

                            ans = std::max(ans, std::max(
                                    dp[i + 1][lastFoodM12][curFood][lastFoodM21][lastFoodM22],
                                    dp[i + 1][lastFoodM11][lastFoodM12][lastFoodM22][curFood]
                                    ));
                        }
    }
    
    std::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