Submission #598976

#	Time	Username	Problem	Language	Result	Execution time	Memory
598976		Jomnoi	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	100 / 100	1400 ms	93732 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;

const int MAX_N = 1e6 + 5;
const int MAX_M = 1e6 + 5;
const int INF = 1e9 + 7;

int w[MAX_N];
bool ans[MAX_M];
vector <tuple <int, int, int>> queries[MAX_N];
int tree[4 * MAX_N];

void update(int idx, int l, int r, int q, int v) {
    if(l == r) {
        tree[idx] = v;
        return;
    }

    int mid = (l + r) / 2;
    if(q <= mid) {
        update(idx * 2, l, mid, q, v);
    }
    else {
        update(idx * 2 + 1, mid + 1, r, q, v);
    }
    tree[idx] = max(tree[idx * 2], tree[idx * 2 + 1]);
}

int query(int idx, int l, int r, int ql, int qr) {
    if(r < ql or qr < l) {
        return 0;
    }
    if(ql <= l and r <= qr) {
        return tree[idx];
    }

    int mid = (l + r) / 2;
    return max(query(idx * 2, l, mid, ql, qr), query(idx * 2 + 1, mid + 1, r, ql, qr));
}

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int N, M;
    cin >> N >> M;

    for(int i = 1; i <= N; i++) {
        cin >> w[i];
    }

    for(int i = 1; i <= M; i++) {
        int l, r, k;
        cin >> l >> r >> k;

        queries[r].emplace_back(l, i, k);
    }

    stack <int> stk;
    for(int i = 1; i <= N; i++) {
        while(!stk.empty() and w[stk.top()] <= w[i]) {
            stk.pop();
        }

        if(!stk.empty()) {
            update(1, 1, N, stk.top(), w[stk.top()] + w[i]);
        }
        stk.push(i);

        for(auto [l, id, k] : queries[i]) {
            ans[id] = (query(1, 1, N, l, i) <= k);
        }
    }

    for(int i = 1; i <= M; i++) {
        cout << ans[i] << '\n';
    }
    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 23 / 23