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	`1`	`+// The rand7() API is already defined for you.`
	`2`	`+// int rand7();`
	`3`	`+// @return a random integer in the range 1 to 7`
	`4`	`+`
	`5`	`+class Solution`
	`6`	`+{`
	`7`	`+public:`
	`8`	`+ int rand10()`
	`9`	`+ {`
	`10`	`+ while (true)`
	`11`	`+ {`
	`12`	`+ int bit1 = rand7();`
	`13`	`+ int bit2 = rand7();`
	`14`	`+`
	`15`	`+ int res = (bit1 - 1) * 7 + bit2;`
	`16`	`+`
	`17`	`+ if (1 <= res && res <= 40)`
	`18`	`+ return res % 10 + 1;`
	`19`	`+ }`
	`20`	`+ }`
	`21`	`+};`

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