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P4269 [USACO18FEB]Snow Boots G
https://www.luogu.com.cn/record/86653460
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Luogu/P4269/P4269.cpp
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86
Luogu/P4269/P4269.cpp
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#include <iostream>
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#include <algorithm>
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#include <deque>
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#include <functional>
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#include <tuple>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int n, b;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> b;
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std::vector<int> a(n), d(n);
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for (int &x : a) cin >> x;
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std::vector<std::pair<int, int>> shoes;
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for (int i = 0, s; i < b; i++) {
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cin >> s >> d[i];
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shoes.emplace_back(i, s);
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}
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std::vector<int> ans(n);
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auto solve = [&](int ql, int qr, int l, int r, auto &&solve) -> void {
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if (ql > qr || l > r) return;
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if (l == r) {
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for (int i = ql; i <= qr; i++) {
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ans[shoes[i].first] = l;
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}
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return;
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}
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int mid = l + r >> 1;
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std::deque<int> q{0};
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std::vector<int> f(n);
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for (int i = 1; i < n; i++) {
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while (!q.empty() && i - q.front() > mid) q.pop_front();
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f[i] = std::max(a[i], f[q.front()]);
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while (!q.empty() && f[i] <= f[q.back()]) q.pop_back();
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q.push_back(i);
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}
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if (shoes[ql].second < *f.rbegin()) {
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solve(ql, qr, mid + 1, r, solve);
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} else if (shoes[qr].second >= *f.rbegin()) {
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solve(ql, qr, l, mid, solve);
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} else {
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int pos = std::lower_bound(
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shoes.begin() + ql,
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shoes.begin() + qr + 1,
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std::make_pair(0, *f.rbegin()),
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[](auto &&lhs, auto &&rhs) -> bool {
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return lhs.second >= rhs.second;
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})
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- shoes.begin();
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solve(ql, pos - 1, l, mid, solve);
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solve(pos, qr, mid + 1, r, solve);
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}
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};
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std::sort(shoes.begin(), shoes.end(), [](auto &&lhs, auto &&rhs) -> bool {
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return lhs.second > rhs.second;
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});
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solve(0, b - 1, 1, n, solve);
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for (int i = 0; i < b; i++) {
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cout << (ans[i] <= d[i]) << endl;
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}
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return 0;
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}
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