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finish 5kyu and rank up to 3 kyu

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[5 kyu]josephus survivor

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`‎[5 kyu]josephus survivor`

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Original file line number	Diff line number	Diff line change
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	`1`	`+def josephus_survivor(n,k):`
	`2`	`+ res = [i for i in range(1,n+1)]`
	`3`	`+ current = (k-1) % len(res)`
	`4`	`+`
	`5`	`+ while len(res) > 1:`
	`6`	`+ res = res[:current] + res[current+1:]`
	`7`	`+ current = (current + k - 1) % len(res)`
	`8`	`+ return res[0]`

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