Commit 0e034c0

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solution of happy number problem

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	`1`	`+// https://leetcode.com/problems/happy-number/`
	`2`	`+package main`
	`3`	`+`
	`4`	`+func isHappy(n int) bool {`
	`5`	`+ nums := make(map[int]struct{})`
	`6`	`+ for {`
	`7`	`+ nn := calc(n)`
	`8`	`+ if nn == 1 {`
	`9`	`+ return true`
	`10`	`+ }`
	`11`	`+ if nn <= 0 {`
	`12`	`+ return false`
	`13`	`+ }`
	`14`	`+ if _, ok := nums[nn]; ok {`
	`15`	`+ return false`
	`16`	`+ }`
	`17`	`+ nums[nn] = struct{}{}`
	`18`	`+ n = nn`
	`19`	`+ }`
	`20`	`+ return false`
	`21`	`+}`
	`22`	`+`
	`23`	`+func calc(n int) int {`
	`24`	`+ r := int(0)`
	`25`	`+ for ; n > 0; n /= 10 {`
	`26`	`+ c := n % 10`
	`27`	`+ r = r + c*c`
	`28`	`+ }`
	`29`	`+ return r`
	`30`	`+}`

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