DP Day 21 |Count Substrings That Differ by One Character LeetCode 1638 Explained Dynamic Programming
Автор: BitChaos
Загружено: 2026-01-19
Просмотров: 10
In this video of DP Series – Day 21, we solve LeetCode 1638: Count Substrings That Differ by One Character using Dynamic Programming.
We will understand:
What the problem is actually asking
Meaning of “differ by exactly one character”
Brute force intuition
Optimized DP approach using:
same[i][j] → matching substrings
diff[i][j] → substrings with exactly one mismatch
Full dry run with example
C++ implementation
Time & space complexity
This is an important interview problem based on substring DP pattern and helps in problems like:
Longest Common Substring
Edit distance variations
String matching DP
👉 Difficulty: Medium
👉 Topic: Dynamic Programming, Strings
👉 DP Series: Day 21
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