diff --git a/leetcode/leetcode75/HeapAndPriorityQueue/215.KthLargestElementinanArray/sol.go b/leetcode/leetcode75/HeapAndPriorityQueue/215.KthLargestElementinanArray/sol.go
new file mode 100644
index 0000000..682d8eb
--- /dev/null
+++ b/leetcode/leetcode75/HeapAndPriorityQueue/215.KthLargestElementinanArray/sol.go
@@ -0,0 +1,59 @@
+// https://leetcode.com/problems/kth-largest-element-in-an-array
+
+package main
+
+import (
+	"container/heap"
+	"fmt"
+	"sort"
+)
+
+// with sorting
+func findKthLargest(nums []int, k int) int {
+	sort.Ints(nums)
+	return nums[len(nums)-k]
+}
+
+// without sorting
+type Heap []int
+
+func (h Heap) Len() int {
+	return len(h)
+}
+
+func (h Heap) Less(i, j int) bool {
+	return h[i] <= h[j]
+}
+
+func (h *Heap) Swap(i, j int) {
+	(*h)[i], (*h)[j] = (*h)[j], (*h)[i]
+}
+
+func (h *Heap) Push(x interface{}) {
+	*h = append(*h, x.(int))
+}
+
+func (h *Heap) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[:n-1]
+	return x
+}
+
+func findKthLargest1(nums []int, k int) int {
+	tmp := Heap(nums)
+	h := &tmp
+	heap.Init(h)
+	for len(*h) > k {
+		heap.Pop(h)
+	}
+	return (*h)[0]
+}
+
+func main() {
+	nums := []int{3, 2, 3, 1, 2, 4, 5, 5, 6}
+	k := 4
+
+	fmt.Println(findKthLargest1(nums, k))
+}
diff --git a/leetcode/leetcode75/HeapAndPriorityQueue/2336.SmallestNumberinInfiniteSet/smallestNumberinInfiniteSet.go b/leetcode/leetcode75/HeapAndPriorityQueue/2336.SmallestNumberinInfiniteSet/smallestNumberinInfiniteSet.go
new file mode 100644
index 0000000..28ce4d3
--- /dev/null
+++ b/leetcode/leetcode75/HeapAndPriorityQueue/2336.SmallestNumberinInfiniteSet/smallestNumberinInfiniteSet.go
@@ -0,0 +1,34 @@
+// https://leetcode.com/problems/smallest-number-in-infinite-set
+
+package main
+
+import "github.com/emirpasic/gods/maps/treemap"
+
+type SmallestInfiniteSet struct {
+	s *treemap.Map
+}
+
+func Constructor() SmallestInfiniteSet {
+	s := treemap.NewWithIntComparator()
+	for i := 1; i <= 1000; i++ {
+		s.Put(i, nil)
+	}
+	return SmallestInfiniteSet{s}
+}
+
+func (this *SmallestInfiniteSet) PopSmallest() int {
+	x, _ := this.s.Min()
+	this.s.Remove(x.(int))
+	return x.(int)
+}
+
+func (this *SmallestInfiniteSet) AddBack(num int) {
+	this.s.Put(num, nil)
+}
+
+/**
+ * Your SmallestInfiniteSet object will be instantiated and called as such:
+ * obj := Constructor();
+ * param_1 := obj.PopSmallest();
+ * obj.AddBack(num);
+ */