1 files changed, 31 insertions, 0 deletions
diff --git a/codeforces/BanBan/rust-solution/src/main.rs b/codeforces/BanBan/rust-solution/src/main.rs
new file mode 100644
index 0000000..e1c0c5c
--- /dev/null
+++ b/codeforces/BanBan/rust-solution/src/main.rs
@@ -0,0 +1,31 @@
+fn readi64(input : &mut dyn Iterator<Item = String>) -> i64 {
+    input.next().unwrap().parse::<i64>().unwrap()
+}
+
+
+
+fn main() {
+    let mut lines = std::io::stdin().lines().map(|line| line.unwrap());
+    let tt = readi64(&mut lines);
+    for _ in 0..tt {
+        let n = readi64(&mut lines);
+        if n == 1 {
+            println!("{n}\n1 2\n");
+        } else {
+            println!("{}", n - 1);
+            let mut v = Vec::with_capacity(n as usize);
+            let mut cnt = 0;
+            let mut i = 0;
+            while cnt != n - 1 && i < n {
+                if (3 * n - 1 - i) % 3 != 0 {
+                    v[i as usize] = 3 * n - 1 - i;
+                    cnt +=1;
+                }
+                i += 1;
+            }
+            for x in &v {
+                println!("{} {}", i * 3 + 1, x);
+            }
+        }
+    }
+}