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44
S2OJ/1562/1562.cpp
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44
S2OJ/1562/1562.cpp
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#include <iostream>
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#include <algorithm>
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#include <set>
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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, k, ans;
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std::pair<int, int> a[N];
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std::multiset<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 >> k;
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for (int i = 1; i <= n; i++) {
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cin >> a[i].first >> a[i].second;
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}
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std::sort(a + 1, a + 1 + n, [&](const std::pair<int, int> &a, const std::pair<int, int> &b) {
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return a.second < b.second;
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});
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for (int i = 1; i <= k; i++) set.insert(0);
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for (int i = 1; i <= n; i++) {
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auto it = set.upper_bound(a[i].first);
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if (it != set.begin()) {
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set.erase(--it);
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set.insert(a[i].second);
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ans++;
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}
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}
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cout << ans << endl;
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return 0;
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}
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