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5017. 垦田计划

• 题意

  略

• 思路

  二分最小需要几天即可
  注意：

  • 天数不能低于k
  • 二分时，若耗时天数小于mid，直接continue

• 代码

  /*
  * @Author: NEFU AB-IN
  * @Date: 2023-08-26 22:46:52
  * @FilePath: \Acwing\5017\5017.cpp
  * @LastEditTime: 2023-08-26 23:12:05
  */
  #include <bits/stdc++.h>
  using namespace std;
  #define int long long
  #undef int#define SZ(X) ((int)(X).size())
  #define ALL(X) (X).begin(), (X).end()
  #define IOS                                                                                                            \ios::sync_with_stdio(false);                                                                                       \cin.tie(nullptr);                                                                                                  \cout.tie(nullptr)
  #define DEBUG(X) cout << #X << ": " << X << '\n'
  typedef pair<int, int> PII;const int N = 1e5 + 10, INF = 0x3f3f3f3f;int t[N], c[N];signed main()
  {//freopen("Tests/input_1.txt", "r", stdin);IOS;int n, m, k, mx = k;cin >> n >> m >> k;for (int i = 1; i <= n; ++ i){cin >> t[i] >> c[i];mx = max(mx, t[i]);}int l = k, r = mx;auto check  = [&](int x){int m_tmp = m;for(int i = 1; i <= n; ++ i){if (x > t[i]) continue;m_tmp -= (t[i] - x) * c[i];if (m_tmp < 0) return false;}return true;};while (l < r){int mid = l + r >> 1;if (check(mid)) r = mid;else l = mid + 1;}cout << r ;return 0;
  }