Count items matching a rule

Array String

85.3% acceptance

Feb 25, 2026

2035

286

You are given an array items, where each items[i] = [typei, colori, namei] describes the type, color, and name of the ith item. Return the number of items that match the given rule.

Solution

Rust

Time O(n)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn count_matches(items: Vec<Vec<String>>, rule_key: String, rule_value: String) -> i32 {
    let idx = match rule_key.as_str() {
      "type" => 0,
      "color" => 1,
      _ => 2,
    };
    items.iter().filter(|item| item[idx] == rule_value).count() as i32
  }
}