Coding Interview
Jason Yang · 04 Aug, 2026
Math and geometry problems in Java split two ways: manipulating a matrix in place with careful index arithmetic, and simulating arithmetic without overflow.
Coding Interview
Jason Yang · 04 Aug, 2026
Bit manipulation in Java rests on a few identities: XOR to cancel pairs, n & (n-1) to strip the lowest set bit, and shifts to add without a plus sign.
Coding Interview
Jason Yang · 04 Aug, 2026
2D DP in Java: when state needs two indices — two strings, a grid, or a mode — reading the recurrence from neighbor cells and rolling the table to O(n) space.
Coding Interview
Jason Yang · 04 Aug, 2026
A trie makes prefix a first-class query in Java: insert and startsWith in O(word length), wildcard matching, and a prefix tree that prunes a grid word search.
Coding Interview
Jason Yang · 04 Aug, 2026
Interval problems in Java almost all start by sorting, then one sweep: what to sort by, the overlap test, and counting concurrent intervals for room counts.
