Strings and Characters

Short string questions are the most common coding prompt at Workday. They come up on phone screens and in campus rounds, often in Java on a shared doc. Each answer fits in about a dozen lines, and then the interviewer asks for it again with less memory, or without the library call you used.

Two tools cover all six problems here. One is a count array with 26 slots, which stays constant space because the alphabet never grows. The other is a pair of indexes that start at the two ends, or one index per string reading from the back. A Java String can't change, so in place always means working on a char[].

Test the empty string and a one-letter string before anything long. Those two inputs break more of these answers than any big case.

WorkdayPremium lesson · Coding round

The 6 Workday problems are below.

1. 1A Premium questionCoding · Easy · Signature problem
2. 2A Premium questionCoding · Easy · Signature problem
3. 3A Premium questionCoding · Easy · Frequently asked

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