Merge pull request TheAlgorithms#547 from criskolonas/master

pomkarnath98 · web-flow · commit 339e2102f952 · 2020-12-19T22:02:13.000+05:30
Added pigeonhole sorting
diff --git a/Sorts/PigeonHoleSort.js b/Sorts/PigeonHoleSort.js
@@ -0,0 +1,38 @@
+/*
+https://en.wikipedia.org/wiki/Pigeonhole_sort
+
+*Pigeonhole sorting is a sorting algorithm that is suitable
+* for sorting lists of elements where the number of elements
+* (n) and the length of the range of possible key values (N)
+* are approximately the same.
+ */
+function pigeonHoleSort (arr) {
+  let min = arr[0]
+  let max = arr[0]
+
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] > max) { max = arr[i] }
+    if (arr[i] < min) { min = arr[i] }
+  }
+  console.log(max)
+  console.log(min)
+
+  const range = max - min + 1
+  const pigeonhole = Array(range).fill(0)
+
+  for (let i = 0; i < arr.length; i++) {
+    pigeonhole[arr[i] - min]++
+  }
+
+  let index = 0
+
+  for (let j = 0; j < range; j++) {
+    while (pigeonhole[j]-- > 0) {
+      arr[index++] = j + min
+    }
+  }
+}
+// Driver code
+const arr = [8, 3, 2, 7, 4, 6, 8]
+pigeonHoleSort(arr)
+console.log(arr)
