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rust-play/playground.rs Secret

Created March 31, 2021 09:51
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playground.rs
#![allow(unused)]
use std::collections::HashSet;
fn main() {
let mut rows: Vec<_> = (0..81).map(|_| HashSet::<u8>::new()).collect();
rows.get(20).as_mut().unwrap().insert(5);
}
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