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Submission #630773

# Submission time Handle Problem Language Result Execution time Memory
630773 2022-08-17T03:17:36 Z Spade1 Miners (IOI07_miners) C++14
100 / 100
 427 ms 201416 KB 
#include<bits/stdc++.h>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define ll long long
#define ld long double
#define st first
#define nd second
#define pb push_back
#define INF INT_MAX
using namespace std;

const int N = 1e5 + 10;
ll dp[N][4][4][4][4];
int f[N];

int g(vector<int> v) {
    int ret = 0;
    for (int i = 1; i <= 3; ++i) {
        for (auto j : v) {
            if (j == i) {
                ++ret;
                break;
            }
        }
    }
    return ret;
}

void solve() {
    int n; cin >> n;
    string s; cin >> s;
    for (int i = 1; i <= n; ++i) {
        if (s[i-1] == 'M') f[i] = 1;
        if (s[i-1] == 'F') f[i] = 2;
        if (s[i-1] == 'B') f[i] = 3;
    }
    memset(dp, -1, sizeof(dp));
    dp[0][0][0][0][0] = 0;
    for (int i = 1; i <= n; ++i) {
        for (int s1 = 0; s1 < 4; ++s1) {
            for (int s2 = 0; s2 < 4; ++s2) {
                for (int s3 = 0; s3 < 4; ++s3) {
                    for (int s4 = 0; s4 < 4; ++s4) {
                        if (dp[i-1][s1][s2][s3][s4] == -1) continue;
                        int l = g({s1, s2, f[i]});
                        dp[i][s2][f[i]][s3][s4] = max(dp[i][s2][f[i]][s3][s4], dp[i-1][s1][s2][s3][s4] + l);
                        l = g({s3, s4, f[i]});
                        dp[i][s1][s2][s4][f[i]] = max(dp[i][s1][s2][s4][f[i]], dp[i-1][s1][s2][s3][s4] + l);
                    }
                }
            }
        }
    }

    ll ans = 0;
    for (int s1 = 0; s1 < 4; ++s1) {
        for (int s2 = 0; s2 < 4; ++s2) {
            for (int s3 = 0; s3 < 4; ++s3) {
                for (int s4 = 0; s4 < 4; ++s4) {
                    ans = max(ans, dp[n][s1][s2][s3][s4]);
                }
            }
        }
    }
    cout << ans << '\n';
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(NULL);
    int t = 1;
//    cin >> t;
    while (t--) {
        solve();
    }
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 200712 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 200780 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 200688 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 200620 KB Output is correct

Subtask #5
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 88 ms 200636 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 200632 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 107 ms 200712 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 105 ms 200624 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 200776 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 160 ms 200888 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 287 ms 201272 KB Output is correct

Subtask #12
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 427 ms 201416 KB Output is correct