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struct Solution;
impl Solution {
pub fn unique_occurrences(arr: Vec<i32>) -> bool {
let (mut counter, mut set) = ([0; 2001], [false; 1000]);
arr.iter().for_each(|&x| counter[(x + 1000) as usize] += 1);
for &x in counter.iter().filter(|&&x| x > 0) {
match set[x as usize] {
true => return false,
false => set[x as usize] = true
}
}
true
}
}
fn main() {
let arr = vec![1,2,2,1,1,3];
print!("{}", Solution::unique_occurrences(arr));
}
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