Code RoomUnsigned underflow infinite loop

HardPrep Room Coding #1912

Unsigned underflow infinite loop

Code reviewCode quality & reviewSenior–Staff~18 min

Review this C++ loop that walks a buffer backwards to find the last non-zero byte.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 18 min

Mark a line and say what kind of problem it is.0 findings

1int lastNonZero(const std::vector<uint8_t>& buf) {

2 for (size_t i = buf.size() - 1; i >= 0; --i) {

3 if (buf[i] != 0) {

4 return static_cast<int>(i);

5 }

6 }

7 return -1;

8}

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.