diff --git a/2202/220217.go b/2202/220217.go
new file mode 100644
index 0000000..8e8c62b
--- /dev/null
+++ b/2202/220217.go
@@ -0,0 +1,34 @@
+package main
+
+import "fmt"
+
+func solver(candidates *[]int, target, prev int) [][]int {
+	ret := make([][]int, 0)
+	for _, v := range *candidates {
+		if v >= prev && (target-v) >= v {
+			t := solver(candidates, target-v, v)
+			for i, _ := range t {
+				t[i] = append([]int{v}, t[i]...)
+			}
+			ret = append(ret, t...)
+		} else if target == v {
+			ret = append(ret, []int{v})
+		}
+	}
+	return ret
+}
+
+func combinationSum(candidates []int, target int) [][]int {
+	return solver(&candidates, target, 0)
+}
+
+func main() {
+	candidate := []int{2, 3, 5}
+	ret := combinationSum(candidate, 8)
+	for _, v := range ret {
+		for _, vv := range v {
+			fmt.Printf("%d ", vv)
+		}
+		fmt.Println()
+	}
+}