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Luogu/P2698/P2698.cpp
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60
Luogu/P2698/P2698.cpp
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <limits>
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#include <set>
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#include <utility>
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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 = 1e5 + 5;
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int n, d, ans = std::numeric_limits<int>::max();
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std::pair<int, int> points[N];
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std::set<int> set;
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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 >> d;
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for (int i = 1; i <= n; i++) {
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cin >> points[i].first >> points[i].second;
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}
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std::sort(points + 1, points + 1 + n, [](auto a, auto b) -> bool {
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return a.second < b.second;
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});
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int lst = 1;
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for (int i = 1; i <= n; i++) {
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int pos = std::upper_bound(points + 1, points + 1 + n, std::make_pair(0, points[i].second - d), [](auto a, auto b) -> bool {
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return a.second < b.second;
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})
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- points;
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for (int j = lst; j < pos; j++) {
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set.insert(points[j].first);
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}
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lst = pos;
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auto it1 = set.lower_bound(points[i].first),
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it2 = set.upper_bound(points[i].first);
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if (it1 != set.begin()) {
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ans = std::min(ans, std::abs(points[i].first - *--it1));
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}
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if (it2 != set.end()) {
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ans = std::min(ans, std::abs(points[i].first - *it2));
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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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