Submission #1267834

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267834		ducdev	Financial Report (JOI21_financial)	C++20	28 / 100	652 ms	201484 KiB

Main

// Author: 4uckd3v - Nguyen Cao Duc
#include <bits/stdc++.h>
using namespace std;

#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef pair<int, int> ii;

const int MAX_N = 3e5;
const int MOD = 1e9 + 7;

template <class X, class Y>
bool maximize(X &x, const Y &y) {
    if (x >= y) return false;
    x = y;
    return true;
};

int n, d;
int a[MAX_N + 5];

namespace SUBTASK_12 {
    const int N = 400;

    int dp[N + 5][N + 5];

    void Solve() {
        for (int i = 0; i <= n; i++) {
            for (int j = 0; j <= n; j++) {
                dp[i][j] = 0;
            };
        };

        for (int i = 1; i <= n; i++) {
            dp[i][a[i]] = 1;
            for (int j = i - 1; j >= max(1, i - d); j--) {
                for (int mx = a[j]; mx <= n; mx++) {
                    maximize(dp[i][max(mx, a[i])], dp[j][mx] + (a[i] > mx));
                };
            };
        };

        int res = 0;
        for (int mx = a[n]; mx <= n; mx++) maximize(res, dp[n][mx]);

        cout << res << '\n';
    };
};  // namespace SUBTASK_12

namespace SUBTASK_3 {
    const int N = 7000;

    int dp[N + 5][N + 5], best[N + 5];
    deque<int> dq[N + 5];

    void Solve() {
        for (int i = 0; i <= n; i++) {
            for (int j = 0; j <= n; j++) {
                dp[i][j] = 0;
            };
        };

        for (int i = 1; i <= n; i++) {
            dp[i][a[i]] = 1;
            for (int mx = 0; mx <= n; mx++) best[mx] = 0;

            for (int mx = 0; mx <= n; mx++) {
                while (!dq[mx].empty() && dq[mx].front() < max(i - d, 1)) dq[mx].pop_front();
                if (!dq[mx].empty()) best[mx] = dp[dq[mx].front()][mx];
            };

            for (int mx = 0; mx <= n; mx++) {
                maximize(dp[i][max(mx, a[i])], best[mx] + (a[i] > mx));
            };

            for (int mx = 0; mx <= n; mx++) {
                while (!dq[mx].empty()) {
                    int j = dq[mx].front();
                    if (dp[j][mx] < dp[i][mx])
                        dq[mx].pop_front();
                    else
                        break;
                };

                dq[mx].push_back(i);
            };
        };

        int res = 0;
        for (int mx = a[n]; mx <= n; mx++) maximize(res, dp[n][mx]);

        cout << res << '\n';
    };
};  // namespace SUBTASK_3

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (fopen("MAIN.INP", "r")) {
        freopen("MAIN.INP", "r", stdin);
        freopen("MAIN.OUT", "w", stdout);
    };

    cin >> n >> d;

    vector<ii> v(n);
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        v[i - 1] = make_pair(a[i], i);
    };

    sort(all(v));
    int cur = 0;

    for (int i = 0; i < n; i++) {
        cur += (i == 0 || v[i - 1].first != v[i].first);
        a[v[i].second] = cur;
    };

    if (n <= 400)
      return SUBTASK_12::Solve(), 0;
    SUBTASK_3::Solve();
};

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:101:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |         freopen("MAIN.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:102:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  102 |         freopen("MAIN.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 12
• Subtask 5: 0 / 5
• Subtask 6: 0 / 35