Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the logic errors pattern
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: Using std::map operator[] to increment the count creates a default entry with a value of 0 if the key doesn't exist, leading to unexpected default entries.
The fix: Use find to check if the key exists before incrementing. If not, initialize it to 1.
Remember: std::map operator[] creates a default entry if the key doesn't exist, which can lead to logic errors in counting scenarios.
The pattern behind it: logic errors.
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