Submission #581178

#	Time	Username	Problem	Language	Result	Execution time	Memory
581178		dxz05	Financial Report (JOI21_financial)	C++14	65 / 100	533 ms	1048576 KiB

Main

#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

#include <random>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 1111;

void compress(vector<int> &a){
    map<int, int> mp;
    for (int &i : a) mp[i] = 0;
    int sz = 0;
    for (auto &now : mp) now.second = ++sz;
    for (int &i : a) i = mp[i];
}

struct Fenwick{
    vector<int> f;
    Fenwick(int n){
        f.assign(n + 5, 0);
    }

    void add(int x, int y){
        while (x < f.size()){
            f[x] = max(f[x], y);
            x += (-x & x);
        }
    }

    int get(int x){
        int res = 0;
        while (x > 0){
            res = max(res, f[x]);
            x -= (-x & x);
        }
        return res;
    }

};

int report(int n, int d, vector<int> a){
    if (d == 1){
        vector<int> cnt(n, 0);
        stack<int> st;
        for (int i = 0; i < n; i++){
            while (!st.empty() && a[st.top()] < a[i]) st.pop();
            int l = (st.empty() ? 0 : st.top() + 1);

            cnt[l]++;
            if (i + 1 < n) cnt[i + 1]--;

            st.push(i);
        }

        for (int i = 1; i < n; i++) cnt[i] += cnt[i - 1];

        int ans = 0;
        for (int i = 0; i < n; i++) ans = max(ans, cnt[i]);

        return ans;
    }

    if (d == n){
        Fenwick F(n);
        int ans = 0;
        for (int i = 0; i < n; i++){
            int x = F.get(a[i] - 1) + 1;
            ans = max(ans, x);
            F.add(a[i], x);
        }
        return ans;
    }

    vector<vector<int>> dp(n, vector<int>(n + 1, -1e9));
    vector<deque<pair<int, int>>> deq(n + 1); // (dp, i)

    for (int i = 0; i < n; i++){
        dp[i][a[i]] = 1;
        for (int val = 1; val <= n; val++){
            while (!deq[val].empty() && deq[val].front().second + d < i) deq[val].pop_front();
        }

        for (int val = 1; val <= n; val++){
            if (deq[val].empty()) continue;
            if (val < a[i]){
                dp[i][a[i]] = max(dp[i][a[i]], deq[val].front().first + 1);
            } else {
                dp[i][val] = max(dp[i][val], deq[val].front().first);
            }
        }

        for (int val = a[i]; val <= n; val++){
            if (dp[i][val] < 1) continue;
            while (!deq[val].empty() && deq[val].back().first <= dp[i][val]) deq[val].pop_back();
            deq[val].emplace_back(dp[i][val], i);
        }
    }

    int ans = 0;
    for (int val = 0; val <= n; val++) ans = max(ans, dp[n - 1][val]);

    return ans;
}

void solve(int TC) {
    int n, d;
    cin >> n >> d;

    vector<int> a(n);
    for (int &i : a) cin >> i;

    compress(a);

    cout << report(n, d, a);

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int TC = 1;
//    cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

#ifdef dddxxz
    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;
#endif

    return 0;
}

Compilation message (stderr)

Main.cpp: In member function 'void Fenwick::add(int, int)':
Main.cpp:62:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         while (x < f.size()){
      |                ~~^~~~~~~~~~

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