All Posts

1575 articles

dsa1 min read

Check if a string follows a given pattern using bidirectional mapping between pattern chars and words.

March 19, 2026Read →

dsa2 min read

Determine if a number is happy by repeatedly summing digit squares and detecting cycles using a HashSet or Floyd algorithm.

March 19, 2026Read →

dsa1 min read

Find if any two duplicate elements are within k indices of each other using a HashMap of last-seen positions.

March 19, 2026Read →

dsa1 min read

Find characters common to all strings in a list by intersecting their frequency arrays with element-wise minimum.

March 19, 2026Read →

dsa1 min read

Count how many stones are jewels by storing jewel types in a HashSet and checking each stone.

March 19, 2026Read →

Page 118 of 315