Submission #102947

#	Time	Username	Problem	Language	Result	Execution time	Memory
102947		wxh010910	Robots (IOI13_robots)	C++17	90 / 100	3042 ms	23160 KiB

robots

#include <bits/stdc++.h>
#include "robots.h"

using namespace std;

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
  sort(X, X + A);
  sort(Y, Y + B);
  vector<pair<int, int>> p(T);
  for (int i = 0; i < T; ++i) {
    p[i] = make_pair(W[i], S[i]);
    if ((!A || W[i] >= X[A - 1]) && (!B || S[i] >= Y[B - 1])) {
      return -1;
    }
  }
  sort(p.begin(), p.end());
  auto check = [&](int t) {
    vector<int> remain(B, t);
    set<pair<int, int>> st;
    for (int i = 0; i < B; ++i) {
      st.insert(make_pair(Y[i], i));
    }
    long long free = 0;
    int j = T - 1;
    for (int i = A - 1; ~i; --i) {
      while (~j && p[j].first >= X[i]) {
        auto it = st.lower_bound(make_pair(p[j].second + 1, -1));
        if (it == st.end()) {
          if (!free) {
            return false;
          } else {
            --free;
          }
        } else if (!--remain[it->second]) {
          st.erase(it);
        }
        --j;
      }
      free += t;
    }
    while (~j) {
      auto it = st.lower_bound(make_pair(p[j].second + 1, -1));
      if (it == st.end()) {
        if (!free) {
          return false;
        } else {
          --free;
        }
      } else if (!--remain[it->second]) {
        st.erase(it);
      }
      --j;
    }
    return true;
  };
  int l = 1, r = T;
  while (l < r) {
    int mid = (l + r) >> 1;
    if (check(mid)) {
      r = mid;
    } else {
      l = mid + 1;
    }
  }
  return r;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 25 / 25
• Subtask 4: 37 / 37
• Subtask 5: 0 / 10