go: add «2349. Design a Number Container System»

URL:	https://leetcode.com/problems/design-a-number-container-system/
Signed-off-by: Matej Focko <me@mfocko.xyz>

go/design-a-number-container-system.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	pq "github.com/emirpasic/gods/v2/queues/priorityqueue"
+)
+
+type NumberContainers struct {
+	mapping map[int]int
+	indices map[int]*pq.Queue[int]
+}
+
+func Constructor() NumberContainers {
+	return NumberContainers{
+		mapping: make(map[int]int),
+		indices: make(map[int]*pq.Queue[int]),
+	}
+}
+
+func (this *NumberContainers) Change(index int, number int) {
+	this.mapping[index] = number
+
+	indices, ok := this.indices[number]
+	if !ok {
+		indices = pq.New[int]()
+		this.indices[number] = indices
+	}
+	indices.Enqueue(index)
+}
+
+func (this *NumberContainers) Find(number int) int {
+	indices, ok := this.indices[number]
+	if !ok {
+		return -1
+	}
+
+	for idx, ok := indices.Peek(); ok; idx, ok = indices.Peek() {
+		if this.mapping[idx] == number {
+			return idx
+		}
+
+		indices.Dequeue()
+	}
+
+	return -1
+}