Merge pull request #172

add new problems 8.04

Author: Ashwagandha-coder

app/src/main/java/com/leetcode_kotlin/AlgorithmLeetcode.kt

@@ -2612,31 +2612,6 @@ fun findRelativeRanks(score: IntArray): Array<String> {
     return ans
 }
 
-/**
- * 347. Top K Frequent Elements
- */
-
-fun topKFrequent(nums: IntArray, k: Int): IntArray? {
-    val map: MutableMap<Int, Int> = HashMap()
-    for (n in nums) {
-        map[n] = map.getOrDefault(n, 0) + 1
-    }
-
-    val heap = PriorityQueue { a: Map.Entry<Int, Int>, b: Map.Entry<Int, Int> ->
-        b.value.compareTo(a.value)
-    }
-
-    for (entry in map.entries) {
-        heap.offer(entry)
-    }
-
-    val res = IntArray(k)
-    for (i in 0 until k) {
-        res[i] = heap.poll().key
-    }
-
-    return res
-}
 
 /**
  * 437. Path Sum III

contest/src/main/java/com/github/contest/Execute.kt

@@ -1,7 +1,7 @@
 package com.github.contest
 
 
-import com.github.contest.strings.isNumber
+import com.github.contest.hashTable.minimumOperations
 import java.util.TreeMap
 
 
@@ -11,7 +11,7 @@ import java.util.TreeMap
 
 fun main() {
 
-    isNumber("6+1").also { println(it) }
+    minimumOperations(intArrayOf(1, 2, 3, 4, 2, 3, 3, 5, 7)).also { println(it) }
 }
 
 fun testing() {

contest/src/main/java/com/github/contest/design/DesignProdVariant.kt

@@ -30,4 +30,43 @@ class ProductOfNumbersProdVariant() {
         }
         return products.last() / products[products.size - k - 1]
     }
+}
+
+/**
+ * 981. Time Based Key-Value Store
+ * Prod Variant
+ */
+
+class TimeMapProdVariant {
+
+    private val store = mutableMapOf<String, MutableList<Pair<Int, String>>>()
+
+    fun set(key: String, value: String, timestamp: Int) {
+        store.getOrPut(key) { mutableListOf(Pair(timestamp, value)) }.also {
+            it.add(Pair(timestamp, value))
+        }
+    }
+
+    fun get(key: String, timestamp: Int): String = when {
+        store[key] == null -> ""
+        else -> getFromList(store.getOrDefault(key, listOf()), timestamp)
+    }
+
+    private fun getFromList(list: List<Pair<Int, String>>, timestamp: Int): String =
+        list.binarySearch {
+            when {
+                it.first == timestamp -> 0
+                it.first < timestamp -> -1
+                else -> 1
+            }
+        }.let { index ->
+            when {
+                index >= 0 -> list[index].second
+                else -> {
+                    val insertionPoint = -index - 1
+                    if (insertionPoint == 0) "" else list[insertionPoint - 1].second
+                }
+            }
+        }
+
 }

contest/src/main/java/com/github/contest/hashTable/HashTableLeetcode.kt

@@ -271,4 +271,64 @@ fun repeatedCharacter(s: String): Char {
     }
 
     return 'a'
+}
+
+/**
+ * 3396. Minimum Number of Operations to Make Elements in Array Distinct
+ */
+
+fun minimumOperations(nums: IntArray): Int {
+    val map = mutableMapOf<Int, Int>()
+    var operations = 0
+
+    for (num in nums) map[num] = map.getOrDefault(num, 0) + 1
+
+    if (map.size == nums.size) return 0
+
+    for (i in nums.indices step 3) {
+        if (i + 2 < nums.size) {
+            val one = nums[i]
+            val two = nums[i + 1]
+            val three = nums[i + 2]
+            map.reduceOrRemove(one)
+            map.reduceOrRemove(two)
+            map.reduceOrRemove(three)
+            var isUnique = true
+            for (value in map.values) {
+                if (value > 1) {
+                    isUnique = false
+                    break
+                }
+            }
+            if (isUnique) return operations + 1
+            operations++
+        }
+    }
+
+    return if (map.isNotEmpty()) operations + 1 else operations
+
+}
+
+private fun MutableMap<Int, Int>.reduceOrRemove(key: Int) {
+    this[key] = this.getOrDefault(key, 0) - 1
+    if (this.getOrDefault(key, 0) == 0) this.remove(key)
+}
+
+/**
+ * 242. Valid Anagram
+ */
+
+fun isAnagram(s: String, t: String): Boolean {
+    if (s.length != t.length) return false
+    val first = IntArray(26)
+    val second = IntArray(26)
+
+    for (char in s) first[char - 'a']++
+    for (char in t) second[char - 'a']++
+
+    for (char in t) {
+        if (first[char - 'a'] == 0 || first[char - 'a'] != second[char - 'a']) return false
+    }
+
+    return true
 }

contest/src/main/java/com/github/contest/priorityqueue/PriorityQueueLeetcode.kt

@@ -0,0 +1,29 @@
+package com.github.contest.priorityqueue
+
+import java.util.PriorityQueue
+
+/**
+ * 347. Top K Frequent Elements
+ */
+
+fun topKFrequent(nums: IntArray, k: Int): IntArray? {
+    val map: MutableMap<Int, Int> = HashMap()
+    for (n in nums) {
+        map[n] = map.getOrDefault(n, 0) + 1
+    }
+
+    val heap = PriorityQueue { a: Map.Entry<Int, Int>, b: Map.Entry<Int, Int> ->
+        b.value.compareTo(a.value)
+    }
+
+    for (entry in map.entries) {
+        heap.offer(entry)
+    }
+
+    val res = IntArray(k)
+    for (i in 0 until k) {
+        res[i] = heap.poll().key
+    }
+
+    return res
+}

contest/src/main/java/com/github/contest/priorityqueue/PriorityQueueProdVariant.kt

@@ -0,0 +1,18 @@
+package com.github.contest.priorityqueue
+
+/**
+ * 347. Top K Frequent Elements
+ */
+
+fun topKFrequentProdVariant(nums: IntArray, k: Int): IntArray {
+    val freq = mutableMapOf<Int, Int>()
+    val repeated = Array<MutableList<Int>>(nums.size + 1) {mutableListOf()}
+
+    for (num in nums) freq[num] = freq.getOrDefault(num, 0) + 1
+
+    for ((num, count) in freq) {
+        repeated[count].add(num)
+    }
+
+    return repeated.flatMap {it}.takeLast(k).toIntArray()
+}

contest/src/main/java/com/github/contest/strings/StringsLeetcode.kt

@@ -89,4 +89,149 @@ fun percentageLetter(s: String, letter: Char): Int {
 }
 
 
+/**
+ * 1309. Decrypt String from Alphabet to Integer Mapping
+ */
+
+fun freqAlphabets(s: String): String {
+    val result = StringBuilder()
+    var i = s.length - 1
+
+    while (i >= 0) {
+        if (s[i] == '#') {
+            val twoDigit = s.substring(i - 2, i).toInt()
+            result.append(getLetterFromIndex(twoDigit - 1))
+            i -= 3
+        } else {
+            result.append(getLetterFromIndex(s[i].digitToInt() - 1))
+            i -= 1
+        }
+    }
+
+    return result.reverse().toString()
+}
+
+fun getLetterFromIndex(index: Int): Char {
+    require(index in 0..25) { "Index must be between 0 and 25 (inclusive)" }
+    return 'a' + index
+}
+
+
+/**
+ *
+ */
+
+fun isNumber(s: String): Boolean = when {
+    isOnlyNumbers(s) -> true
+    hasLetter(s) -> false
+    isValidNumberSign(s) && !hasExponential(s) -> true
+    isNotValidNumberSign(s) -> false
+    else -> hasNumberExponential(s)
+}
+
+private fun hasNumberExponential(str: String): Boolean {
+    var indexExp = 0
+    var isNotDigits = true
+    for (i in str.indices) {
+        if (isExponential(str[i])) {
+            indexExp = i
+            break
+        }
+    }
+
+    for (i in 0 until indexExp) {
+        if (isDigit(str[i])) isNotDigits = false
+    }
+
+    if (isNotDigits) return false
+    isNotDigits = true
+    for (i in indexExp until str.length) {
+        if (str[i] == '.') return false
+        if (isDigit(str[i])) isNotDigits = false
+    }
+
+    return !isNotDigits
+}
+
+private fun isValidNumberSign(str: String): Boolean {
+    var isPlusOrMinus = false
+    var isOneDot = false
+    for (char in str) {
+        if (isSign(char)) {
+            if (isPlusOrMinus) return false
+            else isPlusOrMinus = true
+        }
+        if (isDot(char) && !isOneDot) {
+            isOneDot = true
+            continue
+        }
+        if (isDot(char) && isOneDot) return false
+    }
+    return true
+}
+
+private fun hasExponential(str: String): Boolean {
+    for (char in str) if (isExponential(char)) return true
+    return false
+}
+
+private fun isNotValidNumberSign(str: String): Boolean {
+    var isPlusOrMinus = false
+    var isOneDot = false
+    for (char in str) {
+        if (isSign(char)) {
+            if (isPlusOrMinus) return true
+            else isPlusOrMinus = true
+        }
+        if (isDot(char) && !isOneDot) {
+            isOneDot = true
+            continue
+        }
+        if (isOneDot) return true
+    }
+    return false
+}
+
+private fun hasLetter(str: String): Boolean {
+    for (char in str) {
+        if (isLetter(char)) return true
+    }
+    return false
+}
+
+private fun isOnlyNumbers(str: String): Boolean {
+    for (char in str) {
+        if (isLetter(char) || isExponential(char) || isSign(char) || isDot(char)) return false
+    }
+    return true
+}
+
+fun isDigit(char: Char): Boolean = when {
+    char in '0'..'9' -> true
+    else -> false
+}
+
+fun isLetter(char: Char): Boolean = when {
+    (char != 'e' && char != 'E') && (char in 'a'..'z' || char in 'A'..'Z') -> true
+    else -> false
+}
+
+fun isExponential(char: Char): Boolean = when {
+    char == 'e' || char == 'E' -> true
+    else -> false
+}
+
+fun isDot(char: Char) = when {
+    char == '.' -> true
+    else -> false
+}
+
+fun isSign(char: Char): Boolean {
+    return when {
+        char == '+' || char == '-' -> true
+        else -> false
+    }
+}
+
+