Submission #1173734

#	Time	Username	Problem	Language	Result	Execution time	Memory
1173734		julia_08	Robots (IOI13_robots)	C++20	14 / 100	191 ms	14716 KiB

robots

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

using namespace std;

vector<pair<int, int>> toys;

bool check(int a, int b, int t, int x[], int y[], int k, vector<int> l_a){

  if(k > t) return true;

  vector<int> pre(a + 1), nxt(a + 1), cnt(a + 1, 0);

  for(int i=0; i<a; i++) pre[i] = i - 1, nxt[i] = i + 1;

  pre[0] = 0, nxt[a] = a;

  int l_b = b - 1, cnt_b = 0;

  for(int i=0; i<t; i++){

    auto [s, w] = toys[i];

    if(l_a[i] < a && cnt[l_a[i]] == k) l_a[i] = nxt[l_a[i]];

    if(l_a[i] >= a){

      if(l_b < 0 || y[l_b] <= s) return false;

      cnt_b ++;

      if(cnt_b == k) l_b --, cnt_b = 0;

      continue;
    }

    cnt[l_a[i]] ++;

    if(cnt[l_a[i]] == k){
      nxt[pre[l_a[i]]] = nxt[l_a[i]];
      pre[nxt[l_a[i]]] = pre[l_a[i]];

      l_a[i] = nxt[l_a[i]];
    }

  }

  return true;
}

int bs(int a, int b, int t, int x[], int y[], vector<int> l_a){

  int l = 1, r = t + 1;

  while(l < r){
    int m = l + (r - l) / 2;
    if(check(a, b, t, x, y, m, l_a)) r = m;
    else l = m + 1;
  }

  return r;
}

int putaway(int a, int b, int t, int x[], int y[], int w[], int s[]){

  toys.clear();

  for(int i=0; i<t; i++) toys.push_back({s[i], w[i]});

  sort(toys.rbegin(), toys.rend());

  sort(x, x + a);
  sort(y, y + b);

  vector<int> l_a(t);

  for(int i=0; i<t; i++) l_a[i] = upper_bound(x, x + a, toys[i].second) - x;

  int ans = bs(a, b, t, x, y, l_a);

  return (ans > t ? -1 : ans);
}

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