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How to Solve Total Characters in String After Transformations II Problem
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LeetCode ProblemTotal Characters in String After Transformations II
You are given a string s consisting of lowercase English letters, an integer t representing the number of transformations to perform, and an array nums of size 26. In one transformation, every character in s is replaced according to the following rules: Return the length of the resulting string after exactly t transformations. Since the answer may be very large, return it modulo 109 + 7.
Hash TableMathStringDynamic ProgrammingCounting
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Problem Breakdown
Understanding the Total Characters in String After Transformations II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string s consisting of lowercase English letters, an integer t representing the number of transformations to perform, and an array nums of size 26. In one transformation, every character in s is replaced according to the following rules: Return the length of the resulting string after exactly t transformations. Since the answer may be very large, return it modulo 109 + 7.
HardProblem #3337
LeetCodeTotal Characters in String After Transformations II
Related Topics
Hash TableMathStringDynamic ProgrammingCounting
How Phantom Code Helps
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Examples
# Example 1
Input
s = "abcyy", t = 2, nums = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2]
Output
7
# Example 2
Input
s = "azbk", t = 1, nums = [2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2]
Output
8
Constraints
1 <= s.length <= 105
s consists only of lowercase English letters.
1 <= t <= 109
nums.length == 26
1 <= nums[i] <= 25
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Solve Total Characters in String After Transformations II — You are given a string s consisting of lowercase English letters, an integer t r...
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def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Total Characters in String After Transformations II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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 Total Characters in String After Transformations 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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