# aider_polyglot / polyglot_java_circular-buffer - taskset: [aider_polyglot](https://harnessreport.com/tasks/aider_polyglot.md) - difficulty: medium - category: coding-exercises - language: java - runnable from the site: no - agent timeout: 1800s ## Results by harness _none yet_ ## Instruction ``` # Instructions A circular buffer, cyclic buffer or ring buffer is a data structure that uses a single, fixed-size buffer as if it were connected end-to-end. A circular buffer first starts empty and of some predefined length. For example, this is a 7-element buffer: ```text [ ][ ][ ][ ][ ][ ][ ] ``` Assume that a 1 is written into the middle of the buffer (exact starting location does not matter in a circular buffer): ```text [ ][ ][ ][1][ ][ ][ ] ``` Then assume that two more elements are added — 2 & 3 — which get appended after the 1: ```text [ ][ ][ ][1][2][3][ ] ``` If two elements are then removed from the buffer, the oldest values inside the buffer are removed. The two elements removed, in this case, are 1 & 2, leaving the buffer with just a 3: ```text [ ][ ][ ][ ][ ][3][ ] ``` If the buffer has 7 elements then it is completely full: ```text [5][6][7][8][9][3][4] ``` When the buffer is full an error will be raised, alerting the client that further writes are blocked until a slot becomes free. When the buffer is full, the client can opt to overwrite the oldest data with a forced write. In this case, two more elements — A & B — are added and they overwrite the 3 & 4: ```text [5][6][7][8][9][A][B] ``` 3 & 4 have been replaced by A & B making 5 now the oldest data in the buffer. Finally, if two elements are removed then what would be returned is 5 & 6 yielding the buffer: ```text [ ][ ][7][8][9][A][B] ``` Because there is space available, if the client again uses overwrite to store C & D then the space where 5 & 6 were stored previously will be used not the location of 7 & 8. 7 is still the oldest element and the buffer is once again full. ```text [C][D][7][8][9][A][B] ``` ---- Use the instructions above to modify the supplied files: CircularBuffer.java Don't change the names of existing functions or classes, as they may be referenced from other code like unit tests. Only use standard libraries; don't install additional packages. ``` --- Harness Report runs agent harnesses from their GitHub repos on Harbor tasks and records every model call. Every page is also `.md` and `.json`; index: https://harnessreport.com/llms.txt · MCP: https://harnessreport.com/mcp