Submission #574953

#	Time	Username	Problem	Language	Result	Execution time	Memory
574953		Valters07	Finding Routers (IOI20_routers)	C++14	82.85 / 100	2 ms	340 KiB

routers

#include <bits/stdc++.h>
#include "routers.h"
#pragma GCC optimize("O2,unroll-loops")
#define fio ios_base::sync_with_stdio(0);cin.tie(0);
#define ll long long
#define en cin.close();return 0;
#define pb push_back
#define fi first//printf("%lli\n",cur);
#define se second//scanf("%lli",&n);
#define r0 return 0;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
vector<int> find_routers(int len, int n, int q)
{
    vector<int> ans(n);
    int idx = 0, lst = 0, sq = sqrt(n);
    for(int i = 1;i<n;i++)
    {
        int l = lst, r = len;
        if(l+sq<r)
        {
            int t = use_detector(l+sq);
            if(t==idx)
                l=l+sq;
            else
                r=l+sq-1;
        }
        while(l<r)
        {
            int mid = (l+r+1)/2, ind = use_detector(mid);
            if(ind==idx)
                l=mid;
            else
                r=mid-1;
        }
        int nwpos = lst + (l-lst)*2, nwind = use_detector(nwpos);
        ans[nwind]=nwpos;
        lst=nwpos;
        idx=nwind;
    }
    return ans;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 22.848000000000003 / 40