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"Number of Digit One": update comment

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Original file line number	Diff line number	Diff line change
`@@ -6,7 +6,7 @@ int countDigitOne(int n) {`
`6`	`6`	`if (n >= 1 && n <= 9) return 1;`
`7`	`7`
`8`	`8`	`int x = n; /* first digit of n */`
`9`		`- int v = 1; /* round value of n that all digits are zero except first digit */`
	`9`	`+ int v = 1; /* first dight's weight */`
`10`	`10`	`while (x >= 10) {`
`11`	`11`	`x /= 10;`
`12`	`12`	`v *= 10;`

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