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function twoSum(nums: number[], target: number) {
  const seen = new Map();
  for (let i = 0; i < nums.length; i++) {
    const need = target - nums[i];
    if (seen.has(need)) return [seen.get(need), i];
    seen.set(nums[i], i);
  }
}

$ submit two-sum · python3
▸ compiling... 38ms
▸ test 1/3 ... PASS (2ms)
▸ test 2/3 ... PASS (1ms)
▸ test 3/3 ... PASS (3ms)
▸ verdict: ACCEPTED · 42ms