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Added YouTube link (#31497)

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Added a demonstration of backtracking via YouTube.
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ar03
2018-10-31 10:14:22 -05:00
committed by Paul Gamble
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guide/english/algorithms/backtracking-algorithms/index.md
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[Geeks 4 Geeks](http://www.geeksforgeeks.org/backtracking-set-1-the-knights-tour-problem/) [Geeks 4 Geeks](http://www.geeksforgeeks.org/backtracking-set-1-the-knights-tour-problem/)
[A very interesting introduction to backtracking](https://www.hackerearth.com/practice/basic-programming/recursion/recursion-and-backtracking/tutorial/) [A very interesting introduction to backtracking](https://www.hackerearth.com/practice/basic-programming/recursion/recursion-and-backtracking/tutorial/)
[A YouTube demonstration](https://www.youtube.com/watch?v=gBC_Fd8EE8A)