Submission #420467

#	Time	Username	Problem	Language	Result	Execution time	Memory
420467		egorlifar	Financial Report (JOI21_financial)	C++17	100 / 100	650 ms	27320 KiB

Main

/*
KAMUI!
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*/
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
 
using namespace std;
template<typename T1, typename T2> inline void chkmin(T1 &a, T2 b) {if (a > b) a = b;}
template<typename T1, typename T2> inline void chkmax(T1 &a, T2 b) {if (a < b) a = b;}
#define files(FILENAME) read(FILENAME); write(FILENAME)
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define all(c) (c).begin(), (c).end()
#define sz(c) (int)(c).size()
#define left left228
#define right right228
#define y1 y1228
#define mp make_pair
#define pb push_back
#define y2 y2228
#define rank rank228
using ll = long long;
using ld = long double; 
const string FILENAME = "input";
const int Mod = 998244353;


int sum(int a, int b) {
    return (a + b >= Mod ? a + b - Mod: a + b);
}


int mul(int a, int b) {
    return ((ll)a * b) % Mod;
}


int powm(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1) {
            res = mul(res, a);
        }
        a = mul(a, a);
        b >>= 1;
    }
    return res;
}


int inv(int a) {
    return powm(a, Mod - 2);
}



const int MAXN = 300228;


int n, D;
int a[MAXN];
int rl[MAXN];
int dp[MAXN];
vector<int> kill[MAXN];
int where[MAXN];
int td[MAXN];
int d[MAXN * 4];
int ss = 1;


void change(int i, int x) {
    d[i] = x;
    while (i >> 1 > 0) {
        i >>= 1;
        d[i] = max(d[i * 2], d[i * 2 + 1]);
    }
}


int get(int l, int r) {
    l += ss;
    r += ss;
    int ans = 0;
    while (l <= r) {
        if (l & 1) {
            chkmax(ans, d[l]);
            l++;
        }
        if (!(r & 1)) {
            chkmax(ans, d[r]);
            r--;
        }
        l >>= 1;
        r >>= 1;
    }
    return ans;
}

void solve() {
    cin >> n >> D;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }    
    vector<pair<int, int> > st;
    for (int i = 0; i < n; i++) {
        st.pb(mp(a[i], i));
    }
    sort(all(st));
    int uk1 = 0;
    for (int i = 0; i < n; i++) {
        where[st[i].second] = i;
        while (st[uk1].first < st[i].first) {
            uk1++;
        }
        td[st[i].second] = uk1 - 1;
    }   
    int uk = n - 1;
    set<pair<int, int> > s, sb;
    for (int it = n - 1; it >= 0; it--) {
        int i = st[it].second;
        while (st[uk].first > st[it].first) {
            int j = st[uk].second;
            {
                auto it = s.lower_bound(mp(j, 0));
                vector<pair<int, int> > dels;
                vector<pair<int, int> > adds;
                int l = j;
                int r = j;
                if (it != s.end() && it->first == j + 1) {
                    r = it->second;
                    dels.pb(*it);
                }
                if (it != s.begin()) {
                    it--;
                    if (it->second == j - 1) {
                        l = it->first;
                        dels.pb(*it);
                    }
                }
                adds.pb(mp(l, r));
                for (auto x: dels) {
                    s.erase(x);
                    sb.erase(x);
                }
                for (auto x: adds) {
                    s.insert(x);
                    if (x.second - x.first + 1 > D - 1) {
                        sb.insert(x);
                    }
                }
            }
            uk--;
        }
        auto f = sb.lower_bound(mp(i + 1, 0));
        if (f != sb.begin()) {
            f--;
        }
        int last = n - 1;
        for (auto cur = f; cur != sb.end(); cur++) {
            int ls = max(cur->first, i);
            int rs = ls + D - 1;
            if (rs <= cur->second) {
                last = rs;
                break;
            }
        }
        rl[i] = last;
    }
    while (ss < n) {
        ss <<= 1;
    }
    int ans = 0;
    for (int i = 0; i < n; i++) {
        for (auto x: kill[i]) {
            change(ss + where[x], -1);
        }
        dp[i] = 1 + get(0, td[i]);
        change(ss + where[i], dp[i]);
        kill[rl[i] + 1].pb(i);
        chkmax(ans, dp[i]);
    }
    cout << ans << '\n';
}           


int main() {
    //12:15
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
   // read(FILENAME);
    int t;
    t = 1;
  //  cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}

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