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"feedback" : "# Exercise: sortalgs\n\n### Correctness\n- In `InsertionSort`, in the inner swap-loop you call `data.swap(j, j - 1)` while `j` can become `0` (e.g. when `h == 0`). That would lead to an invalid index `-1` for `j - 1`.\n- In `InsertionSort`, the binary search compares `data.less(m, i)` while `i` is also the index that will be shifted during the subsequent swaps; this means you’re effectively comparing against a moving target (the element at index `i` can change during the shifting process), which can break the correctness of the insertion position logic.\n\n### Suggestion\n- Check the condition of your shifting loop in `InsertionSort`: ensure it stops before you would ever swap with index `-1`. Think about what `h` can be and what the smallest valid `j` is before doing `swap(j, j-1)`.\n- For the binary-search-based insertion: consider how you can keep comparing against the “key element” you want to insert even though you’re only allowed `less(i,j)` and `swap(i,j)`. If the element you’re inserting can move, you may need a strategy where the index used in comparisons always refers to the current position of that key during the search/shift steps.\n\n### Code Style\n- In `SelectionSort`, there’s a large block of commented-out code; remove it once you’ve decided on one approach to keep the file clean and readable.\n- Use consistent loop constructs/variable naming (`i`, `j`, `l`, `h`, `m`) with brief comments for the binary-search insertion idea; otherwise it’s quite hard to follow the intent.\n",
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