Added tasks 2942, 2943, 2944

Author: javadev

src/main/kotlin/g2901_3000/s2942_find_words_containing_character/Solution.kt

@@ -0,0 +1,18 @@
+package g2901_3000.s2942_find_words_containing_character
+
+// #Easy #Array #String #2024_01_07_Time_216_ms_(98.97%)_Space_37.6_MB_(98.46%)
+
+class Solution {
+    fun findWordsContaining(words: Array<String>, x: Char): List<Int> {
+        val ans: MutableList<Int> = ArrayList()
+        for (i in words.indices) {
+            for (j in 0 until words[i].length) {
+                if (words[i][j] == x) {
+                    ans.add(i)
+                    break
+                }
+            }
+        }
+        return ans
+    }
+}

src/main/kotlin/g2901_3000/s2942_find_words_containing_character/readme.md

@@ -0,0 +1,40 @@
+2942\. Find Words Containing Character
+
+Easy
+
+You are given a **0-indexed** array of strings `words` and a character `x`.
+
+Return _an **array of indices** representing the words that contain the character_ `x`.
+
+**Note** that the returned array may be in **any** order.
+
+**Example 1:**
+
+**Input:** words = ["leet","code"], x = "e"
+
+**Output:** [0,1]
+
+**Explanation:** "e" occurs in both words: "l**<ins>ee</ins>**t", and "cod<ins>**e**</ins>". Hence, we return indices 0 and 1. 
+
+**Example 2:**
+
+**Input:** words = ["abc","bcd","aaaa","cbc"], x = "a"
+
+**Output:** [0,2]
+
+**Explanation:** "a" occurs in "**<ins>a</ins>**bc", and "<ins>**aaaa**</ins>". Hence, we return indices 0 and 2. 
+
+**Example 3:**
+
+**Input:** words = ["abc","bcd","aaaa","cbc"], x = "z"
+
+**Output:** []
+
+**Explanation:** "z" does not occur in any of the words. Hence, we return an empty array. 
+
+**Constraints:**
+
+*   `1 <= words.length <= 50`
+*   `1 <= words[i].length <= 50`
+*   `x` is a lowercase English letter.
+*   `words[i]` consists only of lowercase English letters.

src/main/kotlin/g2901_3000/s2943_maximize_area_of_square_hole_in_grid/Solution.kt

@@ -0,0 +1,33 @@
+package g2901_3000.s2943_maximize_area_of_square_hole_in_grid
+
+// #Medium #Array #Sorting #2024_01_07_Time_180_ms_(86.67%)_Space_38.1_MB_(60.00%)
+
+import kotlin.math.max
+import kotlin.math.min
+
+@Suppress("UNUSED_PARAMETER")
+class Solution {
+    fun maximizeSquareHoleArea(n: Int, m: Int, hBars: IntArray, vBars: IntArray): Int {
+        val x = find(hBars)
+        val y = find(vBars)
+        val res = min(x, y) + 1
+        return res * res
+    }
+
+    private fun find(arr: IntArray): Int {
+        arr.sort()
+        var res = 1
+        var i = 0
+        val n = arr.size
+        while (i < n) {
+            var count = 1
+            while (i + 1 < n && arr[i] + 1 == arr[i + 1]) {
+                i++
+                count++
+            }
+            i++
+            res = max(res, count)
+        }
+        return res
+    }
+}

src/main/kotlin/g2901_3000/s2943_maximize_area_of_square_hole_in_grid/readme.md

@@ -0,0 +1,100 @@
+2943\. Maximize Area of Square Hole in Grid
+
+Medium
+
+There is a grid with `n + 2` **horizontal** bars and `m + 2` **vertical** bars, and initially containing `1 x 1` unit cells.
+
+The bars are **1-indexed**.
+
+You are given the two integers, `n` and `m`.
+
+You are also given two integer arrays: `hBars` and `vBars`.
+
+*   `hBars` contains **distinct** horizontal bars in the range `[2, n + 1]`.
+*   `vBars` contains **distinct** vertical bars in the range `[2, m + 1]`.
+
+You are allowed to **remove** bars that satisfy any of the following conditions:
+
+*   If it is a horizontal bar, it must correspond to a value in `hBars`.
+*   If it is a vertical bar, it must correspond to a value in `vBars`.
+
+Return _an integer denoting the **maximum** area of a **square-shaped** hole in the grid after removing some bars (**possibly none**)._
+
+**Example 1:**
+
+![](https://assets.leetcode.com/uploads/2023/11/05/screenshot-from-2023-11-05-22-40-25.png)
+
+**Input:** n = 2, m = 1, hBars = [2,3], vBars = [2]
+
+**Output:** 4
+
+**Explanation:** The left image shows the initial grid formed by the bars.
+
+The horizontal bars are in the range [1,4], and the vertical bars are in the range [1,3].
+
+It is allowed to remove horizontal bars [2,3] and the vertical bar [2].
+
+One way to get the maximum square-shaped hole is by removing horizontal bar 2 and vertical bar 2.
+
+The resulting grid is shown on the right.
+
+The hole has an area of 4.
+
+It can be shown that it is not possible to get a square hole with an area more than 4.
+
+Hence, the answer is 4. 
+
+**Example 2:**
+
+![](https://assets.leetcode.com/uploads/2023/11/04/screenshot-from-2023-11-04-17-01-02.png)
+
+**Input:** n = 1, m = 1, hBars = [2], vBars = [2]
+
+**Output:** 4
+
+**Explanation:** The left image shows the initial grid formed by the bars.
+
+The horizontal bars are in the range [1,3], and the vertical bars are in the range [1,3].
+
+It is allowed to remove the horizontal bar [2] and the vertical bar [2].
+
+To get the maximum square-shaped hole, we remove horizontal bar 2 and vertical bar 2.
+
+The resulting grid is shown on the right.
+
+The hole has an area of 4.
+
+Hence, the answer is 4, and it is the maximum possible. 
+
+**Example 3:**
+
+![](https://assets.leetcode.com/uploads/2023/11/05/screenshot-from-2023-11-05-22-33-35.png)
+
+**Input:** n = 2, m = 3, hBars = [2,3], vBars = [2,3,4]
+
+**Output:** 9
+
+**Explanation:** The left image shows the initial grid formed by the bars.
+
+The horizontal bars are in the range [1,4], and the vertical bars are in the range [1,5].
+
+It is allowed to remove horizontal bars [2,3] and vertical bars [2,3,4].
+
+One way to get the maximum square-shaped hole is by removing horizontal bars 2 and 3, and vertical bars 3 and 4.
+
+The resulting grid is shown on the right.
+
+The hole has an area of 9.
+
+It can be shown that it is not possible to get a square hole with an area more than 9. Hence, the answer is 9. 
+
+**Constraints:**
+
+*   <code>1 <= n <= 10<sup>9</sup></code>
+*   <code>1 <= m <= 10<sup>9</sup></code>
+*   `1 <= hBars.length <= 100`
+*   `2 <= hBars[i] <= n + 1`
+*   `1 <= vBars.length <= 100`
+*   `2 <= vBars[i] <= m + 1`
+*   All values in `hBars` are distinct.
+*   All values in `vBars` are distinct.

src/main/kotlin/g2901_3000/s2944_minimum_number_of_coins_for_fruits/Solution.kt

@@ -0,0 +1,28 @@
+package g2901_3000.s2944_minimum_number_of_coins_for_fruits
+
+// #Medium #Array #Dynamic_Programming #Heap_Priority_Queue #Queue #Monotonic_Queue
+// #2024_01_07_Time_194_ms_(84.62%)_Space_37.5_MB_(92.31%)
+
+import kotlin.math.min
+
+class Solution {
+    fun minimumCoins(prices: IntArray): Int {
+        val n = prices.size
+        val dp = IntArray(n)
+        dp[n - 1] = prices[n - 1]
+        for (i in n - 2 downTo 0) {
+            val pos = i + 1
+            val acquired = i + pos
+            if (acquired + 1 < n) {
+                var min = Int.MAX_VALUE
+                for (j in acquired + 1 downTo i + 1) {
+                    min = min(min.toDouble(), dp[j].toDouble()).toInt()
+                }
+                dp[i] = prices[i] + min
+            } else {
+                dp[i] = prices[i]
+            }
+        }
+        return dp[0]
+    }
+}

src/main/kotlin/g2901_3000/s2944_minimum_number_of_coins_for_fruits/readme.md

@@ -0,0 +1,56 @@
+2944\. Minimum Number of Coins for Fruits
+
+Medium
+
+You are at a fruit market with different types of exotic fruits on display.
+
+You are given a **1-indexed** array `prices`, where `prices[i]` denotes the number of coins needed to purchase the <code>i<sup>th</sup></code> fruit.
+
+The fruit market has the following offer:
+
+*   If you purchase the <code>i<sup>th</sup></code> fruit at `prices[i]` coins, you can get the next `i` fruits for free.
+
+**Note** that even if you **can** take fruit `j` for free, you can still purchase it for `prices[j]` coins to receive a new offer.
+
+Return _the **minimum** number of coins needed to acquire all the fruits_.
+
+**Example 1:**
+
+**Input:** prices = [3,1,2]
+
+**Output:** 4
+
+**Explanation:** You can acquire the fruits as follows:
+
+- Purchase the 1<sup>st</sup> fruit with 3 coins, you are allowed to take the 2<sup>nd</sup> fruit for free.
+
+- Purchase the 2<sup>nd</sup> fruit with 1 coin, you are allowed to take the 3<sup>rd</sup> fruit for free.
+
+- Take the 3<sup>rd</sup> fruit for free.
+
+Note that even though you were allowed to take the 2<sup>nd</sup> fruit for free, you purchased it because it is more optimal.
+
+It can be proven that 4 is the minimum number of coins needed to acquire all the fruits. 
+
+**Example 2:**
+
+**Input:** prices = [1,10,1,1]
+
+**Output:** 2
+
+**Explanation:** You can acquire the fruits as follows:
+
+- Purchase the 1<sup>st</sup> fruit with 1 coin, you are allowed to take the 2<sup>nd</sup> fruit for free.
+
+- Take the 2<sup>nd</sup> fruit for free.
+
+- Purchase the 3<sup>rd</sup> fruit for 1 coin, you are allowed to take the 4<sup>th</sup> fruit for free.
+
+- Take the 4<sup>t</sup><sup>h</sup> fruit for free.
+
+It can be proven that 2 is the minimum number of coins needed to acquire all the fruits. 
+
+**Constraints:**
+
+*   `1 <= prices.length <= 1000`
+*   <code>1 <= prices[i] <= 10<sup>5</sup></code>

src/test/kotlin/g2901_3000/s2942_find_words_containing_character/SolutionTest.kt

@@ -0,0 +1,31 @@
+package g2901_3000.s2942_find_words_containing_character
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun findWordsContaining() {
+        assertThat(
+            Solution().findWordsContaining(arrayOf("leet", "code"), 'e'),
+            equalTo(mutableListOf(0, 1))
+        )
+    }
+
+    @Test
+    fun findWordsContaining2() {
+        assertThat(
+            Solution().findWordsContaining(arrayOf("abc", "bcd", "aaaa", "cbc"), 'a'),
+            equalTo(mutableListOf(0, 2))
+        )
+    }
+
+    @Test
+    fun findWordsContaining3() {
+        assertThat(
+            Solution().findWordsContaining(arrayOf("abc", "bcd", "aaaa", "cbc"), 'z'),
+            equalTo(mutableListOf<Any>())
+        )
+    }
+}

src/test/kotlin/g2901_3000/s2943_maximize_area_of_square_hole_in_grid/SolutionTest.kt

@@ -0,0 +1,31 @@
+package g2901_3000.s2943_maximize_area_of_square_hole_in_grid
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun maximizeSquareHoleArea() {
+        assertThat(
+            Solution().maximizeSquareHoleArea(2, 1, intArrayOf(2, 3), intArrayOf(2)),
+            equalTo(4)
+        )
+    }
+
+    @Test
+    fun maximizeSquareHoleArea2() {
+        assertThat(
+            Solution().maximizeSquareHoleArea(1, 1, intArrayOf(2), intArrayOf(2)),
+            equalTo(4)
+        )
+    }
+
+    @Test
+    fun maximizeSquareHoleArea3() {
+        assertThat(
+            Solution().maximizeSquareHoleArea(2, 3, intArrayOf(2, 3), intArrayOf(2, 3, 4)),
+            equalTo(9)
+        )
+    }
+}

src/test/kotlin/g2901_3000/s2944_minimum_number_of_coins_for_fruits/SolutionTest.kt

@@ -0,0 +1,17 @@
+package g2901_3000.s2944_minimum_number_of_coins_for_fruits
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun minimumCoins() {
+        assertThat(Solution().minimumCoins(intArrayOf(3, 1, 2)), equalTo(4))
+    }
+
+    @Test
+    fun minimumCoins2() {
+        assertThat(Solution().minimumCoins(intArrayOf(1, 10, 1, 1)), equalTo(2))
+    }
+}