Submission #434377

#	Time	Username	Problem	Language	Result	Execution time	Memory
434377		jeqcho	Finding Routers (IOI20_routers)	C++17	70.13 / 100	2 ms	332 KiB

routers

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

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vpi;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define F0R(i,b) FOR(i,0,b)
#define ROF(i,a,b) for(int i=(b)-1;i>=(a);--i)
#define R0F(i,b) ROF(i,0,b)
#define all(x) begin(x),end(x)
#define sz(x) int(x.size())
#define pb push_back
#define rsz resize
#define trav(a,x) for(auto&a :x)
#define fi first
#define se second


vi find_routers(int l, int n, int q)
{
  vi v;
  v.pb(0);
  FOR(i,1,n)
  {
    int lef=v.back();
    int rig=l;
    int ans=-1;
    while(lef<=rig)
    {
      int mid=(lef+rig)/2;
      int res=use_detector(mid);
      if(res<i)
      {
        lef=mid+1;
        ans=mid;
      }
      else{
        rig=mid-1;
      }
    }
    v.pb(ans*2-v.back());
  }
  return v;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 10.1312 / 40