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solution.ts
  1. function twoSum(nums: number[], target: number) {
  2. const seen = new Map<number, number>();
  4. for (let i = 0; i < nums.length; i++) {
  5. const need = target - nums[i];
  6. if (seen.has(need)) {
  7. return [seen.get(need), i];
  8. }
  9. seen.set(nums[i], i);
  10. }
  11. return [];
  12. }