Submission #677734

#	Time	Username	Problem	Language	Result	Execution time	Memory
677734		Alcabel	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	0 / 100	3085 ms	166656 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e6, maxlog = 20;
int w[maxn], Log[maxn + 1], jump[maxn][maxlog];

struct SparseTable {
    int n;
    int st[maxn][maxlog];
    SparseTable() {}
    SparseTable(int _n) {
        n = _n;
    }
    void build() {
        for (int i = 0; i < n; ++i) {
            st[i][0] = jump[i][0];
        }
        for (int j = 1; j <= Log[n]; ++j) {
            for (int i = 0; i + (1 << j) - 1 < n; ++i) {
                st[i][j] = max(st[i][j - 1], st[i + (1 << (j - 1))][j - 1]);
            }
        }
    }
    int getMax(int l, int r) {
        int j = Log[r - l + 1];
        return max(st[l][j], st[r - (1 << j) + 1][j]);
    }
    ~SparseTable() {}
};

void solve() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < n; ++i) {
        cin >> w[i];
        for (int j = 0; j < maxlog; ++j) {
            jump[i][j] = -1;
        }
    }
    vector<int> stk;
    for (int i = 0; i < n; ++i) {
        while (!stk.empty() && w[i] >= w[stk.back()]) {
            stk.pop_back();
        }
        if (!stk.empty()) {
            jump[i][0] = stk.back();
            for (int j = 1; j < maxlog && jump[jump[i][j - 1]][j - 1] != -1; ++j) {
                jump[i][j] = jump[jump[i][j - 1]][j - 1];
            }
        }
        stk.push_back(i);
    }
    SparseTable st(n);
    st.build();
    while (m--) {
        int l, r, k;
        cin >> l >> r >> k;
        --l, --r;
        int left = -1, right = r + 1;
        while (right - left > 1) {
            int mid = left + (right - left) / 2;
            if (st.getMax(r - mid, r) >= l) {
                right = mid;
            } else {
                left = mid;
            }
        }
        r -= right;
        // cerr << "r: " << r << '\n';
        if (r <= l) {
            cout << "1\n";
        } else {
            for (int j = maxlog - 1; j >= 0; --j) {
                if (jump[r][j] != -1 && jump[jump[r][j]][0] >= l) {
                    r = jump[r][j];
                }
            }
            if (w[r] + w[jump[r][0]] > k) {
                cout << "0\n";
            } else {
                cout << "1\n";
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    Log[1] = 0;
    for (int i = 2; i <= maxn; ++i) {
        Log[i] = Log[i >> 1] + 1;
    }

    int T = 1;
    // cin >> T;
    while (T--) {
        solve();
    }

    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23