From f3f70407d91f0fbae19158cd5436d31386d70971 Mon Sep 17 00:00:00 2001
From: nxtsourav7 <nxtsourav7@gmail.com>
Date: Sun, 29 Dec 2024 13:02:14 +0600
Subject: [PATCH] level 7

---
 Codeforces/Div-2/1831/A_Twin_Permutations.cpp | 32 ++++++++++++++++++
 Codeforces/Div-2/1979/B_XOR_Sequences.cpp     | 33 +++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 Codeforces/Div-2/1831/A_Twin_Permutations.cpp
 create mode 100644 Codeforces/Div-2/1979/B_XOR_Sequences.cpp

diff --git a/Codeforces/Div-2/1831/A_Twin_Permutations.cpp b/Codeforces/Div-2/1831/A_Twin_Permutations.cpp
new file mode 100644
index 0000000..5fc6579
--- /dev/null
+++ b/Codeforces/Div-2/1831/A_Twin_Permutations.cpp
@@ -0,0 +1,32 @@
+/**
+ *	author 	: nxtsourav7
+ *	created : 2024-12-29 02:50:33
+**/
+
+#include<bits/stdc++.h>
+using namespace std;
+
+void S0LVE() {
+    int n;
+    cin >> n;
+    vector<int> a(n);
+    for(int &x : a) cin >> x;
+
+    for(int i = 0; i < n; ++i) {
+        cout << abs(n + 1 - a[i]) << ' ';
+    }
+}
+
+int32_t main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int Q;
+    cin >> Q;
+    while(Q--) {
+        S0LVE();
+        cout << '\n';
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/Codeforces/Div-2/1979/B_XOR_Sequences.cpp b/Codeforces/Div-2/1979/B_XOR_Sequences.cpp
new file mode 100644
index 0000000..c5f01c9
--- /dev/null
+++ b/Codeforces/Div-2/1979/B_XOR_Sequences.cpp
@@ -0,0 +1,33 @@
+/**
+ *	author 	: nxtsourav7
+ *	created : 2024-12-29 03:11:27
+**/
+
+#include<bits/stdc++.h>
+using namespace std;
+
+void S0LVE() {
+    int x, y;
+    cin >> x >> y;
+
+    for(int i = 0; i < 30; ++i) {
+        if(((x >> i) & 1) != ((y >> i) & 1)) {
+            cout << (1 << i);
+            return;
+        }
+    }
+}
+
+int32_t main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int Q;
+    cin >> Q;
+    while(Q--) {
+        S0LVE();
+        cout << '\n';
+    }
+
+    return 0;
+}
\ No newline at end of file