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P2949 [USACO09OPEN] Work Scheduling G
https://www.luogu.com.cn/record/166876962
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Luogu/P2949/P2949.cpp
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51
Luogu/P2949/P2949.cpp
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#include <iostream>
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#include <algorithm>
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#include <functional>
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#include <queue>
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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 = 1e5 + 5;
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int n;
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long long ans;
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std::pair<int, int> a[N]; // <time, money>
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std::priority_queue<int, std::vector<int>, std::greater<>> q;
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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;
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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);
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for (int i = 1; i <= n; i++) {
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// 时间充足(每项工作消耗 1 个单位时间)
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if (a[i].first > q.size()) {
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q.emplace(a[i].second); // 记录报酬
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ans += a[i].second;
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} else if (a[i].second > q.top()) { // 时间不足,并且报酬更高
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// 推掉旧工作
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ans -= q.top();
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q.pop();
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// 做新的工作
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q.emplace(a[i].second);
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ans += a[i].second;
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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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