Submission #1252575

#	Time	Username	Problem	Language	Result	Execution time	Memory
1252575		fahmid_rng	Finding Routers (IOI20_routers)	C++20	100 / 100	4 ms	4168 KiB

routers

#include<bits/stdc++.h>
#include "routers.h"
using namespace std;
std::vector<int> find_routers(int l, int n, int q) {
    vector<int> p(n),left(n),right(n,l),query(1e6+1,-1);
    p[0]=0;
    for(int i=1;i<n;++i){
      left[i]=i-1;
    }
    for(int i=1;i<n;++i){
      left[i]=max(p[i-1]+1,left[i]);
      while(right[i]-left[i]>1){
        int mid=(left[i]+right[i])/2;
        if(query[mid]==-1){
          query[mid]=use_detector(mid);
        }
        int q=query[mid];
        //if(q==i-1){left[i]=mid;}
        left[q+1]=mid;
        //else{right=mid;}
        for(int j=1;j<=q;++j){
          right[j]=mid;
        }
      }
      p[i]=2*left[i]-p[i-1];
    }
    return p;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 40 / 40