LeetCode 2167: Minimum Time to Remove All Cars Containing Illegal Goods Solution

Master LeetCode problem 2167 (Minimum Time to Remove All Cars Containing Illegal Goods), a hard 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.

2167. Minimum Time to Remove All Cars Containing Illegal Goods

Hard

String Dynamic Programming

Problem Explanation

Explanation:

To solve this problem, we can iterate through the input string s and count the number of cars containing illegal goods from both ends. We can then compare the counts from left to right and right to left to find the minimum time required to remove all cars containing illegal goods.

Here are the steps:

Initialize two pointers left and right to keep track of the count of cars containing illegal goods from the left and right ends respectively.
Iterate through the string from left to right and increment left whenever we encounter a car containing illegal goods.
Iterate through the string from right to left and increment right whenever we encounter a car containing illegal goods.
Compare left and right to find the minimum time required to remove all cars containing illegal goods.
Return the minimum time obtained.

Time complexity: O(n) where n is the length of the input string s.
Space complexity: O(1)

Solution Code

class Solution {
    public int minTimeToType(String s) {
        int left = 0, right = 0;
        int n = s.length();
        
        for (int i = 0; i < n; i++) {
            if (s.charAt(i) == '1') {
                left++;
            }
        }
        
        int minTime = Math.min(left, n - left);
        
        for (int i = n-1; i >= 0; i--) {
            if (s.charAt(i) == '1') {
                right++;
            }
            minTime = Math.min(minTime, right + n - 1 - i);
        }
        
        return minTime;
    }
}

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