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並前往https://codereview.stackexchange.com/questions/146339/btreemap-as-a-multimap-in-rust

BTreeMap as a multimap in Rust - Code Review Stack ...

use std::collections::BTreeMap; fn insert_dup<V>(map: &mut BTreeMap<i32, Vec<V>>, k: i32, v: V) { map.entry(k).or_insert_with(Vec::new).push(v) } fn ...

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