Leetcode Problem 2361. Minimum Costs Using the Train Line

2361. Minimum Costs Using the Train Line

Leetcode Solutions

Space-Optimized Bottom-Up Dynamic Programming

  1. Initialize prevRegularLane to 0 and prevExpressLane to expressCost.
  2. Iterate over the stops from 1 to n, and for each stop i, calculate the cost for both lanes:
    • regularLaneCost is the cost to reach i via the regular lane.
    • expressLaneCost is the cost to reach i via the express lane.
  3. Store the minimum of regularLaneCost and expressLaneCost in the result array ans.
  4. Update prevRegularLane and prevExpressLane with the costs for the current stop.
  5. Return the array ans.
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Top-Down Dynamic Programming

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