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g2001_2100.s2057_smallest_index_with_equal_value.readme.md Maven / Gradle / Ivy

2057\. Smallest Index With Equal Value

Easy

Given a **0-indexed** integer array `nums`, return _the **smallest** index_ `i` _of_ `nums` _such that_ `i mod 10 == nums[i]`_, or_ `-1` _if such index does not exist_.

`x mod y` denotes the **remainder** when `x` is divided by `y`.

**Example 1:**

**Input:** nums = [0,1,2]

**Output:** 0

**Explanation:**

i=0: 0 mod 10 = 0 == nums[0].

i=1: 1 mod 10 = 1 == nums[1].

i=2: 2 mod 10 = 2 == nums[2].

All indices have i mod 10 == nums[i], so we return the smallest index 0. 

**Example 2:**

**Input:** nums = [4,3,2,1]

**Output:** 2

**Explanation:**

i=0: 0 mod 10 = 0 != nums[0].

i=1: 1 mod 10 = 1 != nums[1].

i=2: 2 mod 10 = 2 == nums[2].

i=3: 3 mod 10 = 3 != nums[3].

2 is the only index which has i mod 10 == nums[i]. 

**Example 3:**

**Input:** nums = [1,2,3,4,5,6,7,8,9,0]

**Output:** -1

**Explanation:** No index satisfies i mod 10 == nums[i]. 

**Constraints:**

*   `1 <= nums.length <= 100`
*   `0 <= nums[i] <= 9`