LeetCode 1871: Jump Game VII Solution

Master LeetCode problem 1871 (Jump Game VII), a medium 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.

1871. Jump Game VII

Medium

String Dynamic Programming Sliding Window Prefix Sum

Problem Explanation

Explanation:

To solve this problem, we can use a sliding window approach along with dynamic programming. We will keep track of the valid positions we can reach at each step by maintaining a boolean array. We start from the first position and iterate through the array, updating the boolean array based on whether we can reach the current position from a valid previous position within the valid range.

At each step, we check if the current position is a '0' and if there is a valid position in the range [i - maxJump, i - minJump] from which we can reach the current position. If so, we mark the current position as reachable.

Finally, we return whether the last position is reachable or not.

Time Complexity:

The time complexity of this approach is O(n), where n is the length of the input string s.

Space Complexity:

The space complexity is O(n) for the boolean array.

: :

Solution Code

class Solution {
    public boolean canReach(String s, int minJump, int maxJump) {
        int n = s.length();
        boolean[] dp = new boolean[n];
        dp[0] = true;
        
        int count = 0;
        for (int i = 1; i < n; i++) {
            if (s.charAt(i) == '0' && i >= minJump) {
                count += dp[i - minJump] ? 1 : 0;
            }
            if (i > maxJump && s.charAt(i - maxJump) == '0') {
                count -= dp[i - maxJump] ? 1 : 0;
            }
            dp[i] = count > 0;
        }
        
        return dp[n - 1];
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 1871 (Jump Game VII)?

This page provides optimized solutions for LeetCode problem 1871 (Jump Game VII) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 1871 (Jump Game VII)?

The time complexity for LeetCode 1871 (Jump Game VII) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 1871 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 1871 in Java, C++, or Python.

Back to LeetCode Solutions