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two-sum · C#
public int[] TwoSum(int[] nums, int target) {
var map = new Dictionary<int, int>();
for (int i = 0; i < nums.Length; i++) {
if (map.ContainsKey(target - nums[i]))
return new[] { map[target - nums[i]], i };
map[nums[i]] = i;
}
return Array.Empty<int>();
}
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