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How to Solve Shortest Distance After Road Addition Queries II Problem
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Start Free for WindowsHard#3244
LeetCode ProblemShortest Distance After Road Addition Queries II
You are given an integer n and a 2D integer array queries. There are n cities numbered from 0 to n - 1. Initially, there is a unidirectional road from city i to city i + 1 for all 0 <= i < n - 1. queries[i] = [ui, vi] represents the addition of a new unidirectional road from city ui to city vi. After each query, you need to find the length of the shortest path from city 0 to city n - 1. There are no two queries such that queries[i][0] < queries[j][0] < queries[i][1] < queries[j][1]. Return an array answer where for each i in the range [0, queries.length - 1], answer[i] is the length of the shortest path from city 0 to city n - 1 after processing the first i + 1 queries.
ArrayGreedyGraphOrdered Set
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Problem Breakdown
Understanding the Shortest Distance After Road Addition Queries II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an integer n and a 2D integer array queries. There are n cities numbered from 0 to n - 1. Initially, there is a unidirectional road from city i to city i + 1 for all 0 <= i < n - 1. queries[i] = [ui, vi] represents the addition of a new unidirectional road from city ui to city vi. After each query, you need to find the length of the shortest path from city 0 to city n - 1. There are no two queries such that queries[i][0] < queries[j][0] < queries[i][1] < queries[j][1]. Return an array answer where for each i in the range [0, queries.length - 1], answer[i] is the length of the shortest path from city 0 to city n - 1 after processing the first i + 1 queries.
HardProblem #3244
LeetCodeShortest Distance After Road Addition Queries II
Related Topics
ArrayGreedyGraphOrdered Set
How Phantom Code Helps
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Examples
# Example 1
Input
n = 5, queries = [[2,4],[0,2],[0,4]]
Output
[3,2,1]
# Example 2
Input
n = 4, queries = [[0,3],[0,2]]
Output
[1,1]
Constraints
3 <= n <= 105
1 <= queries.length <= 105
queries[i].length == 2
0 <= queries[i][0] < queries[i][1] < n
1 < queries[i][1] - queries[i][0]
There are no repeated roads among the queries.
There are no two queries such that i != j and queries[i][0] < queries[j][0] < queries[i][1] < queries[j][1].
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Solve Shortest Distance After Road Addition Queries II — You are given an integer n and a 2D integer array queries. There are n cities nu...
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 Shortest Distance After Road Addition Queries II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Shortest Distance After Road Addition Queries 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.
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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.
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What coding mistakes does Phantom Code help me avoid during Shortest Distance After Road Addition Queries 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 Shortest Distance After Road Addition Queries II during live interviews?
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How does Phantom Code help when I'm struggling with Shortest Distance After Road Addition Queries 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 Shortest Distance After Road Addition Queries 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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