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4653. [Noi2016] 区间
https://hydro.ac/d/bzoj/record/63a46331cf75a716a1673eab
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BZOJ/4653/4653.cpp
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113
BZOJ/4653/4653.cpp
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#include <iostream>
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#include <algorithm>
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#include <limits>
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#include <utility>
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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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const int N = 5e5 + 5;
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struct node {
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int l, r, m, d;
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node(int _l = 0, int _r = 0)
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: l(_l), r(_r), m(0), d(0) {}
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} tr[N << 3];
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void pushup(int u) {
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tr[u].m = std::max(tr[u << 1].m, tr[u << 1 | 1].m);
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}
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void pushdown(int u) {
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if (!tr[u].d) return;
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tr[u << 1].d += tr[u].d;
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tr[u << 1 | 1].d += tr[u].d;
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tr[u << 1].m += tr[u].d;
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tr[u << 1 | 1].m += tr[u].d;
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tr[u].d = 0;
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}
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void build(int u, int l, int r) {
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tr[u] = node(l, r);
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if (l == r) return;
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int mid = l + r >> 1;
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build(u << 1, l, mid);
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build(u << 1 | 1, mid + 1, r);
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}
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void modify(int u, int l, int r, int v) {
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if (l <= tr[u].l && tr[u].r <= r) {
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tr[u].d += v;
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tr[u].m += v;
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return;
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}
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pushdown(u);
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int mid = tr[u].l + tr[u].r >> 1;
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if (l <= mid) modify(u << 1, l, r, v);
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if (r > mid) modify(u << 1 | 1, l, r, v);
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pushup(u);
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}
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int n, m, ans = std::numeric_limits<int>::max();
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std::pair<int, int> seg[N];
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std::vector<int> nums;
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int len(int p) {
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return nums[seg[p].second - 1] - nums[seg[p].first - 1];
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}
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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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int n, m;
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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cin >> seg[i].first >> seg[i].second;
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nums.emplace_back(seg[i].first);
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nums.emplace_back(seg[i].second);
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}
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std::sort(seg + 1, seg + 1 + n, [&](const std::pair<int, int> &a, const std::pair<int, int> &b) {
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return a.second - a.first < b.second - b.first;
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});
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std::sort(nums.begin(), nums.end());
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nums.erase(std::unique(nums.begin(), nums.end()), nums.end());
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for (int i = 1; i <= n; i++) {
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seg[i].first = std::lower_bound(nums.begin(), nums.end(), seg[i].first) - nums.begin() + 1;
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seg[i].second = std::lower_bound(nums.begin(), nums.end(), seg[i].second) - nums.begin() + 1;
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}
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build(1, 1, nums.size());
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for (int i = 1, l = 1; i <= n; i++) {
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modify(1, seg[i].first, seg[i].second, 1);
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while (tr[1].m >= m) {
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ans = std::min(ans, len(i) - len(l));
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modify(1, seg[l].first, seg[l].second, -1);
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l++;
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}
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}
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cout << (ans == std::numeric_limits<int>::max() ? -1 : ans) << endl;
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return 0;
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}
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