From 4a2fcbb8be203b11ea7bdd8e9fe7ab5780ac261b Mon Sep 17 00:00:00 2001
From: Musojon <musojontursunov925@gmail.com>
Date: Thu, 6 Jul 2023 17:01:50 +0500
Subject: [PATCH] adding solutions for 20-day's problems

---
 solutions/039.md | 13 +++++++++++++
 solutions/040.md | 18 ++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 solutions/039.md
 create mode 100644 solutions/040.md

diff --git a/solutions/039.md b/solutions/039.md
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index 0000000..3732403
--- /dev/null
+++ b/solutions/039.md
@@ -0,0 +1,13 @@
+### Typescript
+1720. Decode XORed Array
+
+```Typescript
+function decode(encoded: number[], first: number): number[] {
+    const arr:number[]=[first];
+    for(let i=0;i<encoded.length;i++){
+        let newItem = arr[i]^encoded[i]
+        arr.push(newItem)
+    }
+    return arr
+};
+```
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diff --git a/solutions/040.md b/solutions/040.md
new file mode 100644
index 0000000..562b03a
--- /dev/null
+++ b/solutions/040.md
@@ -0,0 +1,18 @@
+### Typescript
+2657. Find the Prefix Common Array of Two Arrays
+
+```Typescript
+function findThePrefixCommonArray(A: number[], B: number[]): number[] {
+    const answer:number[]=[]
+    for(let i=0;i<A.length;i++){
+        let commonCount=0
+        for(let j=0;j<=i;j++){
+            if(A.slice(0,i+1).includes(B.slice(0,i+1)[j])){
+                commonCount+=1
+            }
+        }
+        answer.push(commonCount)
+    }
+    return answer
+};
+```
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