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Smallest Index With Digit Sum Equal to Index

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	`1`	`+Link: https://leetcode.com/problems/smallest-index-with-digit-sum-equal-to-index/`
	`2`	`+Language: C#`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+public class Solution {`
	`10`	`+ public int SmallestIndex(int[] nums)`
	`11`	`+ {`
	`12`	`+ for (int i = 0; i < nums.Length; i++)`
	`13`	`+ {`
	`14`	`+ if (nums[i] >= 0)`
	`15`	`+ {`
	`16`	`+ int sum = 0;`
	`17`	`+ while (nums[i] > 0)`
	`18`	`+ {`
	`19`	`+ int index = nums[i] % 10;`
	`20`	`+ sum += index;`
	`21`	`+ nums[i] /= 10;`
	`22`	`+ }`
	`23`	`+ if (sum == i)`
	`24`	`+ return i;`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+`
	`28`	`+ return -1;`
	`29`	`+ }`
	`30`	`+}`

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