deno.land / x / masx200_leetcode_test@10.6.5 / find-the-duplicate-number / index.ts
123456789101112export default function findDuplicate(nums: number[]): number { const cache = new Set<number>(); for (const n of nums) { if (cache.has(n)) { return n; } else { cache.add(n); } } return nums[0];}
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