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How to Solve Earliest Second to Mark Indices II Problem
Master the Earliest Second to Mark Indices II LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#3049
LeetCode ProblemEarliest Second to Mark Indices II
You are given two 1-indexed integer arrays, nums and, changeIndices, having lengths n and m, respectively. Initially, all indices in nums are unmarked. Your task is to mark all indices in nums. In each second, s, in order from 1 to m (inclusive), you can perform one of the following operations: Return an integer denoting the earliest second in the range [1, m] when all indices in nums can be marked by choosing operations optimally, or -1 if it is impossible.
ArrayBinary SearchGreedyHeap (Priority Queue)
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Problem Breakdown
Understanding the Earliest Second to Mark Indices II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given two 1-indexed integer arrays, nums and, changeIndices, having lengths n and m, respectively. Initially, all indices in nums are unmarked. Your task is to mark all indices in nums. In each second, s, in order from 1 to m (inclusive), you can perform one of the following operations: Return an integer denoting the earliest second in the range [1, m] when all indices in nums can be marked by choosing operations optimally, or -1 if it is impossible.
HardProblem #3049
LeetCodeEarliest Second to Mark Indices II
Related Topics
ArrayBinary SearchGreedyHeap (Priority Queue)
How Phantom Code Helps
Get real-time assistance for Earliest Second to Mark Indices II problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
nums = [3,2,3], changeIndices = [1,3,2,2,2,2,3]
Output
6
# Example 2
Input
nums = [0,0,1,2], changeIndices = [1,2,1,2,1,2,1,2]
Output
7
# Example 3
Input
nums = [1,2,3], changeIndices = [1,2,3]
Output
-1
Constraints
1 <= n == nums.length <= 5000
0 <= nums[i] <= 109
1 <= m == changeIndices.length <= 5000
1 <= changeIndices[i] <= n
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Solve Earliest Second to Mark Indices II — You are given two 1-indexed integer arrays, nums and, changeIndices, having leng...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Earliest Second to Mark Indices II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Earliest Second to Mark Indices II during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Earliest Second to Mark Indices II?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Earliest Second to Mark Indices II?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Earliest Second to Mark Indices II type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Earliest Second to Mark Indices II interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Earliest Second to Mark Indices II during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Earliest Second to Mark Indices II style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Earliest Second to Mark Indices II interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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