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Crashes

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  • Stack overflows
  • Uncaught exceptions
  • Memory corruption

Wrong output

  • Off-by-one errors
  • Logic bugs
  • Floating-point issues
  • Failing unit tests

Performance

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  • Quadratic hot spots
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  • Slow queries

Environment

  • Build and dependency errors
  • Compiler errors
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Example order

One debugging order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief
Object-Oriented ProgrammingUndergradDue in 24 hours

Merge sort fails 3 of 12 tests

The student’s merge sort passes small inputs but fails three tests and times out on 100,000 elements. Fix it without rewriting the algorithm.

Requirements
  • Keep the student’s structure
  • Fix the failing tests
  • Fix the timeout
  • Explain each bug
02The solution
MergeSort.diff12 lines
1@@ MergeSort.java · merge() @@
2- int[] tmp = new int[a.length]; // full array, every call
3+ int[] tmp = new int[hi - lo + 1]; // only the range being merged
4 int i = lo, j = mid + 1, k = 0;
5 while (i <= mid && j <= hi)
6- tmp[k++] = (a[i] < a[j]) ? a[i++] : a[j++];
7+ tmp[k++] = (a[i] <= a[j]) ? a[i++] : a[j++];
8 while (i <= mid) tmp[k++] = a[i++];
9 while (j <= hi) tmp[k++] = a[j++];
10- for (k = 0; k < hi - lo; k++) // drops the last element
11+ for (k = 0; k <= hi - lo; k++)
12 a[lo + k] = tmp[k];
12 / 12 tests passing · 100k sort in 41 ms
03The explanation doc
explanation.pdf
1.
Bug 1: the timeout
A full-size array was allocated on every merge call. Sizing it to the range fixes the slowdown.
2.
Bug 2: lost elements
The copy-back loop stopped one short, dropping the last element of each range.
3.
Bug 3: stability
Using <= keeps equal elements in their original order, which one test checked.
04The price
AI predicted budget
$40–$80
Level · UndergradIncluded
Deadline · 24 hoursRush
Shown before any contact details were shared.
Final price from our team
$55
Delivered 3h early
How it works

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The AI does one job: it predicts your price. A person on our team reviews your files and sets the final number.

  1. 01
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  2. 02
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  3. 03
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  4. 04
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Typical orders

Common requests and typical budgets.

Single bug or error message
$30–$70
Usually same day
typical range
Failing test suite
$50–$120
Usually 1–2 days
typical range
Segfault or memory bug
$60–$140
Usually 1–2 days
typical range
Autograder timeout
$60–$150
Usually 1–2 days
typical range

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