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▽桃の天然水 ●02/05 06:30 2025-02-04AtCoder Beginner Contest 391 Fhttps://atcoder.jp/contests/abc391/tasks/abc391_fA, B, Cを降順に並べ直すと、と取ればが最も大きくなります。その次は、のどれかになります。PriorityQueueを使えば簡単にK番目を求められます。PriorityQueueに重複してTripletを入れてはいけないのでHashSetを使っています。TripletをHashSetのキーにするには、Hash traitを実装すればよいです。// K-th Largest Triplet #![allow(non_snake_case)] use std::collections::{BinaryHeap, HashSet}; use std::hash::{Hash, Hasher}; //////