majority-element-ii/src/main.rs


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fn main() {
    println!("Hello, world!");
    let tests = [
        vec![3,2,3],
        vec![1],
        vec![1,2]
    ];

    for test in tests {
        let result = Solution::majority_element(test.clone());
        println!("{test:?} is {result:?}");
    }
}

struct Solution;

use std::collections::HashMap;

impl Solution {
    pub fn majority_element(nums: Vec<i32>) -> Vec<i32> {
        let mut occurance: HashMap<&i32, i32> = HashMap::new();
        
        for num in &nums {
            occurance.entry(num).and_modify(|x| {*x += 1}).or_insert(0);
        }
        occurance.iter().filter(|(_, &occ)| occ >= nums.len() as i32 / 3).map(|(&&num,_)| num).collect()
    }
}