How should I practice Compute Walking Distance?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Tiktok online assessment problems in FastPrep.

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Problem · Array

Compute Walking Distance

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Starting from position 0, you need to carry cargo to a target position. Along the way there are charging stations at various positions. The process works as follows:

Walk with the cargo to the nearest charging station ahead of your current position.
Use a drone at that station to carry the cargo forward by 10 units (i.e., from station position p to p + 10).
Repeat until the cargo reaches or passes the target.
If no station is ahead, walk the remaining distance on foot.

Compute the total distance you actually carry the cargo on foot (excluding drone-traveled parts).

Approach: Sort the stations. Each round, find the next usable station ahead of your current position, add the walking distance to reach it, then update your position to station + 10. Repeat until reaching or passing the target.

Examples

01 · Example 1

target = 15
stations = [5]
return = 5

Walk from 0 to station 5 (5 units on foot). Drone carries cargo from 5 to 15. Position 15 >= target 15, done. Total walking distance = 5.

02 · Example 2

target = 25
stations = [5,20]
return = 10

Walk from 0 to station 5 (5 units). Drone carries 5 → 15. Walk from 15 to station 20 (5 units). Drone carries 20 → 30. Position 30 >= target 25, done. Total walking = 5 + 5 = 10.