CF Testcase Highlighter

Quickly identify individual test cases in Codeforces submission inputs.

CF Testcase Highlighter makes debugging competitive programming submissions on Codeforces faster, cleaner, and error-free. When viewing test details for a Codeforces submission, Codeforces displays test input, output, and answer blocks as continuous, unseparated text. When your solution fails on a specific testcase (for example, Test #15), manually locating where that test begins and ends inside hundreds of raw lines requires tedious, error-prone line counting. CF Testcase Highlighter automatically groups the physical lines of each individual test case across Input, Output, and Answer blocks, highlighting the complete test case on hover with clearly visible test case numbers (#1, #2, #3, etc.). KEY FEATURES: • Multi-Section Grouping: Groups test cases across Input, Output, and Answer blocks simultaneously. • Hover Highlighting: Hovering over any line in a testcase highlights all corresponding lines together. • Matched Testcase Badges: Displays the test case number (#1, #2, #3, etc.) on hover so you instantly know which test you are looking at. • Copy-Safe: Test case badges use visual-only pseudo-elements so copying test data yields clean, raw input without extra labels. • Customizable Settings: Easily toggle whether line 1 specifies the test count 't', and customize 'Lines per test' and 'Lines per answer'. • Instant Reset: One-click Reset restores original raw Codeforces formatting immediately. • 100% Local & Privacy-Friendly: Operates entirely locally inside your browser. No external servers, no tracking, and zero data collection. HOW TO USE: 1. Open any Codeforces submission page or test details view. 2. Configure settings in the panel inserted directly above the submission section: - Check 'First line is t' if the first line is the test count. - Set 'Lines per test' to the number of lines each test takes (e.g., 3). 3. Click 'Highlight'. 4. Hover over any line in the Input, Output, or Answer section to inspect the full testcase. LIMITATIONS (V1.0.0): Version 1.0.0 supports inputs and outputs where each test case occupies a fixed number of physical lines. Variable-line testcase structures are not currently supported in V1.