Submission #1159850

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159850		FIFI_cpp	Constellation 3 (JOI20_constellation3)	C++20	0 / 100	1 ms	2112 KiB

constellation3

#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
#include <cstdlib>
#include <cmath>
#include <queue>
#include <stack>
#include <deque>
#include <fstream>
#include <iterator>
#include <set>
#include <map>
#include <unordered_map>
#include <iomanip>
#include <cctype>
#include <string>
#include <cassert>
#include <set>
#include <bitset>
#include <unordered_set>
#include <numeric>

#define all(a) a.begin(), a.end()
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define ppi pair<int,pair<int,int>>
#define int int64_t

using namespace std;
//    /\_/\
//   (= ._.)
//   / >  \>
// encouraging cat
const int INF = 10000000000000000;
//const int mod = 1000000007;
const int mod = 998244353;
const int MAXN = 200005;
//ifstream fin('xor.in');
//ofstream fout('xor.out');
const int K = 25;
int n;
long long st[K + 1][MAXN];
int lg[MAXN+1];
void precompute()
{
    lg[1] = 0;
    for (int i = 2; i <= MAXN; i++)
        lg[i] = lg[i/2] + 1;
}
void init(vector<int> array)
{
    copy(array.begin(), array.end(), st[0]);

    for (int i = 1; i <= K; i++)
    {
        for (int j = 0; j + (1 << i) <= n; j++)
        {
            st[i][j] = max(st[i - 1][j], st[i - 1][j + (1 << (i - 1))]);
        }
    }
}
int query(int l,int r)
{
    int i = lg[r - l + 1];
    int maximum = max(st[i][l], st[i][r - (1 << i) + 1]);
    return maximum;
}
vector<multiset<vector<int>>> stars;
vector<int> a,val, dp, diff, taken;
int res = 0;
signed main()
{
    cin >> n;
    a.resize(n);
    dp.resize(n,0);
    precompute();
    vector<pair<int,int>> b(n);
    vector<pair<int,int>> lr(n, {-1,-1});
    vector<int> pref(n,0), suf(n,0);
    int curr = 0;
    for (int i = 0;i < n;i++)
    {
        cin >> a[i];
        b[i].first = a[i];
        b[i].second = i;
        curr = max(curr, a[i]);
        pref[i] = curr;
    }
    init(a);
    curr = 0;
    for (int i = n - 1;i >= 0;i--)
    {
        curr = max(curr, a[i]);
        suf[i] = curr;
    }
    sort(all(b));
    //a.push_back(INF);
    int M;
    cin >> M;
    stars.resize(n);
    val.resize(M,0);
    diff.resize(n,0);
    taken.resize(n,0);
    int sum = 0;
    for (int i = 0;i < M;i++)
    {
        int x,y,c;
        cin >> x >> y >> c;
        x--;
        stars[x].insert({y,c, i});
        val[i] = c;
        sum += c;
    }
    //solve(-1, n, INF);
    vector<bool> visited(n, false);
    for (int i = 0;i < n;i++)
    {
        int pos = b[i].second;
        int M = b[i].first;
        int l = lr[b[i].second].first;
        int r = lr[b[i].second].second;
        visited[b[i].second] = true;
        if (l != -1)
        {
            if (stars[l].size() > stars[pos].size())
            {
                swap(stars[l], stars[pos]);
            }
            stars[pos].insert(all(stars[l]));
        }
        if (r != -1)
        {
            if (stars[r].size() > stars[pos].size())
            {
                swap(stars[r], stars[pos]);
            }
            stars[pos].insert(all(stars[r]));
        }
        int lb = -1,rb = -1;
        int lo = 0, hi = pos - 1, mid = (lo + hi) / 2;
        while (lo < hi)
        {
            mid = (lo + hi + 1) / 2;
            if (query(mid, pos - 1) >= M)
            {
                lo = mid;
            }
            else
            {
                hi = mid - 1;
            }
        }
        if (query(lo, pos - 1) < M || visited[lo])
        {
            lo = -1;
        }
        lb = lo;
        lo = pos + 1, hi = n - 1, mid = (lo + hi + 1) / 2;
        while (lo < hi)
        {
            mid = (lo + hi) / 2;
            if (query(pos + 1, mid) >= M)
            {
                hi = mid;
            }
            else
            {
                lo = mid + 1;
            }
        }
        if (query(pos + 1, lo) < M | visited[lo])
        {
            lo = -1;
        }
        rb = lo;
        int limit = INF;
        int dir = 0; // 0 -> n/a 1-> left 2-> right
        if (lb != -1)
        {
            if (a[lb] < limit)
            {
                limit = a[lb];
                dir = 1;
            }
        }
        if (rb != -1)
        {
            if (a[rb] < limit)
            {
                limit = a[rb];
                dir = 2;
            }
        }
        int Lans = 0;
        int Rans = 0;
        if (l != -1)
        {
            Lans = dp[l];
        }
        if (r != -1)
        {
            Rans = dp[r];
        }
        int ad = 0;
        int s = 0;
        for (auto i : stars[pos])
        {
            if (i[0] > limit)
            {
                break;
            }
            s += val[i[2]];
            ad = max(ad, val[i[2]]);
        }
        int high = 0;
        for (auto i: stars[pos])
        {
            if (i[0] <= limit)
            {
                continue;
            }
            high = max(high, val[i[2]]);
            val[i[2]] -= ad;
        }
        res = max(res, max(Lans + Rans + high, Lans + Rans + ad));
        dp[pos] = Lans + Rans + ad;
        if (dir == 1)
        {
            lr[lb].second = pos;
        }
        else if (dir == 2)
        {
            lr[rb].first = pos;
        }
        auto it = stars[pos].lower_bound({limit, INF, INF});
        stars[pos].erase(stars[pos].begin(), it);
    }
    cout << sum - res << '\n';
    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 65