Code RoomReference invalidated by rehash

HardPrep Room Coding #1807

Reference invalidated by rehash

Code reviewAlgorithms & data structuresSenior–Staff~30 min

Review this C++ code holding a reference across map inserts.

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 30 min

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

1#include <unordered_map>

2#include <string>

3

4void build(std::unordered_map<int, std::string>& m) {

5 std::string& slot = m[1];

6 slot = "one";

7 for (int i = 2; i < 100000; ++i) {

8 m[i] = std::to_string(i);

9 }

10 slot += "-final";

11}

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