FastPrepRobot Charging Poll

Robot Charging Poll

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Problem statement

A repeatedly called polling function assigns robots to charging stations. batteryLevels[p][r] is the battery percentage of robot r at poll p. There are chargerCount stations numbered from 0. Each station holds at most one robot.

A working robot needs charging when its battery is below 50%. A charging robot leaves its station when its battery is above 95%. Equality at either threshold does not trigger that transition.

The problem statement continues
Pro

Examples

Example 1

batteryLevels = [[40,30],[96,45],[60,96]]chargerCount = 1return = [[0,-1],[-1,0],[-1,-1]]

Robot 0 first occupies station 0. At the next poll it leaves before robot 1 is assigned. Robot 1 leaves at the last poll.

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FastPrep Pro
Reported in 1 Amazon interview this week

Unlock this recently reported problem

FastPrep Pro gives you full access to interview problems reported within the last week.

  • Full problem statement and constraints
  • 2 more worked examples, explained
  • Guided hints and editorial
  • Run your code on real test cases
$8.25/month

$99 billed yearly — or $19 month-to-month. Cancel anytime.

Free plan — 2 of 2 free unlocks used this week