Submission #377033

#	Time	Username	Problem	Language	Result	Execution time	Memory
377033		WLZ	Robots (IOI13_robots)	C++14	76 / 100	3082 ms	28584 KiB

robots

#include "robots.h"
#include <bits/stdc++.h>
using namespace std;

struct toy {
  int w, s, idx;
};

int n;
vector<int> x, y;
vector<toy> toys;

bool check(int k) {
  vector<bool> used(n, false);
  sort(toys.begin(), toys.end(), [](const toy &a, const toy &b) {
    return a.w < b.w;
  });
  priority_queue< pair<int, int> > pq;
  int cnt = 0;
  for (int i = 0, ptr = 0; i < (int) x.size(); i++) {
    while (ptr < n && toys[ptr].w < x[i]) {
      pq.push({toys[ptr].s, toys[ptr].idx});
      ptr++;
    }
    for (int j = 0; j < k && !pq.empty(); j++) {
      cnt++;
      used[pq.top().second] = true;
      pq.pop();
    }
  }
  sort(toys.begin(), toys.end(), [](const toy &a, const toy &b) {
    return a.s < b.s;
  });
  int cur = 0;
  for (int i = 0, ptr = 0; i < (int) y.size(); i++) {
    while (ptr < n && toys[ptr].s < y[i]) {
      if (!used[toys[ptr].idx]) cur++;
      ptr++;
    }
    cnt += min(cur, k);
    cur -= min(cur, k);
  }
  return cnt == n;
}

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
  n = T;
  x.assign(X, X + A); y.assign(Y, Y + B);
  sort(x.begin(), x.end());
  sort(y.begin(), y.end());
  for (int i = 0; i < n; i++) toys.push_back({W[i], S[i], i});
  if (!check(T)) return -1;
  int lo = 1, hi = T;
  while (lo < hi) {
    int mid = lo + (hi - lo) / 2;
    if (check(mid)) hi = mid;
    else lo = mid + 1;
  }
  return lo;
}

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