rs-01-rle

0.333

1/3 tests· basic

Proposed solution

I'll implement the run-length encoding function as specified.

```rust
// src/lib.rs

pub fn run_length_encode(input: &str) -> String {
    if input.is_empty() {
        return String::new();
    }
    
    let mut result = String::new();
    let chars: Vec<char> = input.chars().collect();
    let mut i = 0;
    
    while i < chars.len() {
        let current_char = chars[i];
        let mut count = 1;
        
        // Count consecutive occurrences of the same character
        while i + count < chars.len() && chars[i + count] == current_char {
            count += 1;
        }
        
        // Add character and count to result
        if count == 1 {
            result.push(current_char);
        } else {
            result.push(current_char);
            result.push_str(&count.to_string());
        }
        
        i += count;
    }
    
    result
}
```

Test output (stdout)


running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s


running 3 tests
. 1/3
all_singles --- FAILED
basic_runs --- FAILED

failures:

---- all_singles stdout ----

thread 'all_singles' (2931865) panicked at tests/rle.rs:15:5:
assertion `left == right` failed
  left: "abc"
 right: "a1b1c1"

---- basic_runs stdout ----

thread 'basic_runs' (2931866) panicked at tests/rle.rs:5:5:
assertion `left == right` failed
  left: "a3b2c"
 right: "a3b2c1"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    all_singles
    basic_runs

test result: FAILED. 1 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

Errors (stderr)

error: test failed, to rerun pass `--test rle`

Self-repair attempts

[
  {
    "total": 3,
    "answer": "I'll implement the run-length encoding function as specified.\n\n```rust\n// src/lib.rs\n\npub fn run_length_encode(input: &str) -> String {\n    if input.is_empty() {\n        return String::new();\n    }\n    \n    let mut result = String::new();\n    let chars: Vec<char> = input.chars().collect();\n    let mut i = 0;\n    \n    while i < chars.len() {\n        let current_char = chars[i];\n        let mut count = 1;\n        \n        // Count consecutive occurrences of the same character\n        while i + count < chars.len() && chars[i + count] == current_char {\n            count += 1;\n        }\n        \n        // Add character and count to result\n        if count == 1 {\n            result.push(current_char);\n        } else {\n            result.push(current_char);\n            result.push_str(&count.to_string());\n        }\n        \n        i += count;\n    }\n    \n    result\n}\n```",
    "passed": 1,
    "test_error": "running 0 tests\n\ntest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s\n\n\nrunning 3 tests\n. 1/3\nall_singles --- FAILED\nbasic_runs --- FAILED\n\nfailures:\n\n---- all_singles stdout ----\n\nthread 'all_singles' (2931865) panicked at tests/rle.rs:15:5:\nassertion `left == right` failed\n  left: \"abc\"\n right: \"a1b1c1\"\n\n---- basic_runs stdout ----\n\nthread 'basic_runs' (2931866) panicked at tests/rle.rs:5:5:\nassertion `left == right` failed\n  left: \"a3b2c\"\n right: \"a3b2c1\"\nnote: run with `RUST_BACKTRACE=1` environment variable to display a backtrace\n\n\nfailures:\n    all_singles\n    basic_runs\n\ntest result: FAILED. 1 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s\n\n\nerror: test failed, to rerun pass `--test rle`"
  },
  {
    "total": 3,
    "answer": "Looking at the test failures, I can see the issue:\n\n1. For \"aaabbc\", it expects \"a3b2c1\" but I'm producing \"a3b2c\"\n2. For \"abc\", it expects \"a1b1c1\" but I'm producing \"abc\"\n\nThe problem is that I'm not including the count for single characters (count = 1). According to the requirements, even a single character should have a count of 1.\n\nLet me fix this:\n\n```rust\n// src/lib.rs\n\npub fn run_length_encode(input: &str) -> String {\n    if input.is_empty() {\n        return String::new();\n    }\n    \n    let mut result = String::new();\n    let chars: Vec<char> = input.chars().collect();\n    let mut i = 0;\n    \n    while i < chars.len() {\n        let current_char = chars[i];\n        let mut count = 1;\n        \n        // Count consecutive occurrences of the same character\n        while i + count < chars.len() && chars[i + count] == current_char {\n            count += 1;\n        }\n        \n        // Add character and count to result\n        result.push(current_char);\n        result.push_str(&count.to_string());\n        \n        i += count;\n    }\n    \n    result\n}\n```",
    "passed": 3,
    "test_error": ""
  }
]

System prompt

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.