Submission #432046

#	Time	Username	Problem	Language	Result	Execution time	Memory
432046		MilosMilutinovic	Miners (IOI07_miners)	C++14	0 / 100	1585 ms	844 KiB

miners

#include <bits/stdc++.h>
using namespace std;

int dp[2][4][4][4][4];

int count_diff(int x, int y, int z) {
    set<int> values;

    if (x != 0) values.insert(x);
    if (y != 0) values.insert(y);
    if (z != 0) values.insert(z);

    return values.size();
}

const int inf = 1e9;

void clear_dp(int par) {
    for (int d1 = 0; d1 < 4; d1++)
        for (int d2 = 0; d2 < 4; d2++)
            for (int d3 = 0; d3 < 4; d3++)
                for (int d4 = 0; d4 < 4; d4++)
                    dp[par][d1][d2][d3][d4] = inf;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;
    string S;
    cin >> S;

    vector<int> A(N);
    for (int i = 0; i < N; i++) {
        if (S[i] == 'M') A[i] = 1;
        if (S[i] == 'F') A[i] = 2;
        if (S[i] == 'B') A[i] = 3;
    }

    int val = A[0];

    clear_dp(0);

    dp[0][A[0]][A[0]][0][0] = 1;
    dp[0][0][0][A[0]][A[0]] = 1;

    int curr = 1, prev = 0;

    for (int i = 1; i < N; i++) {
        int d = A[i];
        clear_dp(curr);

        for (int d1 = 0; d1 < 4; d1++)
            for (int d2 = 0; d2 < 4; d2++)
                for (int d3 = 0; d3 < 4; d3++)
                    for (int d4 = 0; d4 < 4; d4++) {
                        dp[curr][d][d1][d3][d4] =  max(dp[curr][d][d1][d3][d4], dp[prev][d1][d2][d3][d4] + count_diff(d, d1, d2));
                        dp[curr][d1][d2][d][d3] =  max(dp[curr][d1][d2][d][d3], dp[prev][d1][d2][d3][d4] + count_diff(d, d3, d4));
                    }

        swap(curr, prev);
    }

    int answer = 0;
    for (int d1 = 1; d1 < 4; d1++)
        for (int d2 = 1; d2 < 4; d2++)
            for (int d3 = 1; d3 < 4; d3++)
                for (int d4 = 1; d4 < 4; d4++)
                    answer = max(answer, dp[(N - 1) & 1][d1][d2][d3][d4]);

    cout << answer;
    return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:42:9: warning: unused variable 'val' [-Wunused-variable]
   42 |     int val = A[0];
      |         ^~~

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