T275386 录像

https://www.luogu.com.cn/record/86965128

Luogu/T275386/T275386.cpp

@@ -0,0 +1,44 @@
+#include <iostream>
+#include <algorithm>
+#include <set>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int n, k, ans;
+std::pair<int, int> a[N];
+std::multiset<int> set;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> k;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].first >> a[i].second;
+    }
+
+    std::sort(a + 1, a + 1 + n, [&](const std::pair<int, int> &a, const std::pair<int, int> &b) {
+        return a.second < b.second;
+    });
+
+    for (int i = 1; i <= k; i++) set.insert(0);
+
+    for (int i = 1; i <= n; i++) {
+        auto it = set.upper_bound(a[i].first);
+
+        if (it != set.begin()) {
+            set.erase(--it);
+            set.insert(a[i].second);
+            ans++;
+        }
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}