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LeetCode 2739: Total Distance Traveled Solution

Master LeetCode problem 2739 (Total Distance Traveled), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2739. Total Distance Traveled

Easy
MathSimulation

Problem Explanation

Explanation

To solve this problem, we can simulate the process of fuel consumption and fuel injection from the additional tank to the main tank whenever 5 liters of fuel are consumed from the main tank. We keep track of the total distance traveled and return the maximum distance that can be traveled.

Algorithm

  1. Initialize variables distance to 0, mainFuel to mainTank, additionalFuel to additionalTank.
  2. While mainFuel is greater than 0:
    • Increment distance by 10 km (since mileage is 10 km per liter).
    • Decrement mainFuel by 1.
    • If mainFuel becomes 0, check if additionalFuel is greater than 0:
      • If yes, transfer 1 liter of fuel from additionalFuel to mainFuel.
      • Reset mainFuel to 1.
      • Decrement additionalFuel by 1.
  3. Return the distance as the maximum distance traveled.

Time Complexity

The time complexity of this algorithm is O(max(mainTank, additionalTank)) since we iterate through the fuel consumption process.

Space Complexity

The space complexity of this algorithm is O(1) as we are using a constant amount of extra space for variables.

Solution Code

class Solution {
    public int maxDistance(int mainTank, int additionalTank) {
        int distance = 0;
        int mainFuel = mainTank;
        int additionalFuel = additionalTank;
        
        while (mainFuel > 0) {
            distance += 10;
            mainFuel--;
            if (mainFuel == 0 && additionalFuel > 0) {
                mainFuel = 1;
                additionalFuel--;
            }
        }
        
        return distance;
    }
}

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