GDG COMSATS: 15 Days Of Leetcode Challenge

Key Takeaways

For questions that ask for:

• Find the Most or Least Frequent Element
• Count Specific Elements
• Anagrams
• Sort or Arrange Based on Frequency
• Find the smallest substring containing all characters of another string

Calculate Frequency First

int[] freq = new int[26]; // Only English letters (a-z)
for (char c : s.toCharArray()) {
    freq[c - 'a']++; // Count frequency
}

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