제출 #639790

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
639790		Trent	Global Warming (CEOI18_glo)	C++17	100 / 100	919 ms	26964 KiB

glo

#include "bits/stdc++.h"
#include <unordered_map>

using namespace std;
#define ll long long
#define open(g) string _name_ = g; freopen((_name_ + ".in").c_str(), "r", stdin); freopen((_name_ + ".out").c_str(), "w", stdout)
#define printArr(a, len) for(int asdf = 0; asdf < (len); ++asdf) cout << (a)[asdf] << ' '; cout << '\n';
#define boost() cin.sync_with_stdio(0); cin.tie(0)
#define forR(i, x) for(int i = 0; i < x; ++i)
#define REP(i, a, b) for(int i = (a); i < (b); ++i)
#define all(i) i.begin(), i.end()
#define pii pair<int, int>
#define vi vector<int>
#define si set<int>
#define usi unordered_set<int>
#define mii map<int, int>
#define umii unordered_map<int, int>
#define gp_hash_table unordered_map

const int MV = 2e9 + 10, MN = 4e5 + 10;
struct BIT{
    vector<int> comp;
    int bit[MN];
    void init(set<int>& vals){
        comp.clear();
        for(int& i : bit) i = 0;
        for(int i : vals) comp.push_back(i);
    }
    void upd(int i, int v){
        // get array index of i
        i = lower_bound(all(comp), i) - comp.begin();
        ++i;
        for(; i < MN; i+=i&-i) bit[i] = max(bit[i], v);
    }
    int qu(int i){
        i = lower_bound(all(comp), i) - comp.begin();
        ++i;
        int ma = 0;
        for(; i > 0; i-=i&-i) ma = max(ma, bit[i]);
        return ma;
    }
};

BIT bit;

int arr[MN], I[MN], D[MN];
signed main(){
    int n, x; cin >> n >> x;
    forR(i, n) cin >> arr[i];
    set<int> vals;

    vals.clear();
    forR(i, n) vals.insert(arr[i]), vals.insert(arr[i] - 1);
    bit.init(vals);
    forR(i, n) {
        bit.upd(arr[i], I[i] = bit.qu(arr[i] - 1) + 1);
    }

    vals.clear();
    forR(i, n) vals.insert(MV - arr[i]), vals.insert(MV - arr[i] - 1);
    bit.init(vals);
    for(int i = n - 1; i >= 0; --i){
        bit.upd(MV - arr[i], D[i] = bit.qu(MV - arr[i] - 1) + 1);
    }

    vals.clear();
    forR(i, n) vals.insert(arr[i]), vals.insert(arr[i] + x - 1);
    bit.init(vals);
    int ma = 0;
    forR(i, n){
        ma = max(ma, bit.qu(arr[i] + x - 1) + D[i]);
        bit.upd(arr[i], I[i]);
    }
    cout << ma << '\n';
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25