Sync LeetCode submission Runtime - 61 ms (86.32%), Memory - 17.8 MB (53.07%)

Author: jimit105

3621-minimum-operations-to-make-array-values-equal-to-k/README.md

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+<p>You are given an integer array <code>nums</code> and an integer <code>k</code>.</p>
+
+<p>An integer <code>h</code> is called <strong>valid</strong> if all values in the array that are <strong>strictly greater</strong> than <code>h</code> are <em>identical</em>.</p>
+
+<p>For example, if <code>nums = [10, 8, 10, 8]</code>, a <strong>valid</strong> integer is <code>h = 9</code> because all <code>nums[i] &gt; 9</code>&nbsp;are equal to 10, but 5 is not a <strong>valid</strong> integer.</p>
+
+<p>You are allowed to perform the following operation on <code>nums</code>:</p>
+
+<ul>
+	<li>Select an integer <code>h</code> that is <em>valid</em> for the <strong>current</strong> values in <code>nums</code>.</li>
+	<li>For each index <code>i</code> where <code>nums[i] &gt; h</code>, set <code>nums[i]</code> to <code>h</code>.</li>
+</ul>
+
+<p>Return the <strong>minimum</strong> number of operations required to make every element in <code>nums</code> <strong>equal</strong> to <code>k</code>. If it is impossible to make all elements equal to <code>k</code>, return -1.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [5,2,5,4,5], k = 2</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">2</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>The operations can be performed in order using valid integers 4 and then 2.</p>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [2,1,2], k = 2</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">-1</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>It is impossible to make all the values equal to 2.</p>
+</div>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [9,7,5,3], k = 1</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">4</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>The operations can be performed using valid integers in the order 7, 5, 3, and 1.</p>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 100 </code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 100</code></li>
+	<li><code>1 &lt;= k &lt;= 100</code></li>
+</ul>

3621-minimum-operations-to-make-array-values-equal-to-k/solution.py

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+# Approach 1: Hash Set
+
+# Time: O(n)
+# Space: O(n)
+
+class Solution:
+    def minOperations(self, nums: List[int], k: int) -> int:
+        st = set()
+        for num in nums:
+            if num < k:
+                return -1
+            elif num > k:
+                st.add(num)
+
+        return len(st)
+