# Give a list and a number.
# Return a list of indices of two numbers


class Solution:
    def twoSum(self, nums: list[int], target: int) -> list[int]:
        """
        answer = []
        for i in range(len(nums)):
            another = target - nums[i]

            # both number in the list
            if another in nums:
                if nums[i] == another:
                    temp_list = nums.copy()
                    temp_list.pop(i)
                    if another in temp_list:
                        answer.append(i)
                        answer.append(temp_list.index(another) + 1)
                        return answer

                    if another not in temp_list:
                        continue
                answer.append(i)
                answer.append(nums.index(another))
                return answer

        return answer
        """
        num_map = {}
        for i, num in enumerate(nums):
            complement = target - num
            # reduce compare times
            if complement in num_map:
                return [num_map[complement], i]
            num_map[num] = i
        return []


test = [3, 2, 4]
TARGET_NUMBER = 6
a = Solution().twoSum(test, TARGET_NUMBER)
print(a)

test2 = [i for i in range(1, 10001)]
TARGET_NUMBER = 19999
print(test2[9998], test2[9999])
print(Solution().twoSum(test2, TARGET_NUMBER))