Two Sum - LeetCode 1 - Python

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Most teachers introduce solutions as fully-formed recipes. But in doing so, they totally miss how solutions are DISCOVERED. In painstaking detail, I go through this crucial missing piece and demonstrate how to methodically attack problems from every possible angle.

My video for Two Sum II (the sequel to this problem):

0:00 Two sum problem statement
0:19 Initial thought process
1:12 Brute-force implementation & analysis
3:00 Optimizing our initial approach
7:25 Implementing a faster algorithm
7:47 One-pass?
9:52 Awkward code
12:00 The most important part
  1. Gordon Zhu
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  6. leetcode two sum
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Комментарии
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I am deeply impressed by your use of pen and paper, even the clever little slider. Pen and paper is what helps me the most with thinking about programming.

catocall
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This is such nugget of gold! You've explained everything soo well, keep it coming!!

rohinv
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The question said "you may assume each input has exactly one solution"
Hence the solution either has no number repeated in the array, or the solution is a repeated number in 2 indices.

IdrisIdris-xqki