Submission #883527

#	Time	Username	Problem	Language	Result	Execution time	Memory
883527		ibm2006	Finding Routers (IOI20_routers)	C++17	98.01 / 100	1 ms	600 KiB

routers

#include<bits/stdc++.h>
#include "routers.h"
using namespace std;
typedef int ll;
ll n,i,j,k,L,l,r,x,y,z,w,le[110000],ri[110000],b[110000];
vector<ll> a;
ll f(ll x,ll y)
{
    ll l=x,r=L,z;
    l=max(l,le[y]);
    r=min(r,ri[y]);
    ll mid=(l+r+1)/2;
    while(l<r)
    {
       mid=(l+r+1)/2;
       z=use_detector(mid);
       ri[z]=min(ri[z],mid-1);
       le[z-1]=min(le[z-1],mid);
       if(z==y-1)
       {
           l=mid;
       }
       else
        r=mid-1;
    }
    mid=(l+r+1)/2;
    b[y]=mid;
    return (mid-x)*2+x;
}
vector<int> find_routers(int l, int n, int q) {
    L=l;
    a.resize(n);
	for(i=0;i<n;i++)
        ri[i]=l;
	for(i=1;i<n;i++)
    {
        a[i]=f(a[i-1],i);
    }
    return a;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 38.0096 / 40