From adb33aa593b96e6c9e94f798c3c6e1fda8c5e8da Mon Sep 17 00:00:00 2001
From: Philippe Zwietering <philippe.zwietering@gmail.com>
Date: Mon, 1 May 2023 15:49:18 +0200
Subject: [PATCH] Finished abc050

---
 atcoder/beginner_contests/abc050/src/bin/d.rs | 39 ++++++++++++++++++-
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/atcoder/beginner_contests/abc050/src/bin/d.rs b/atcoder/beginner_contests/abc050/src/bin/d.rs
index ee80563..313060c 100644
--- a/atcoder/beginner_contests/abc050/src/bin/d.rs
+++ b/atcoder/beginner_contests/abc050/src/bin/d.rs
@@ -1,3 +1,38 @@
-fn main() {
-    unimplemented!();
+use std::collections::HashMap;
+
+use proconio::input;
+
+const MOD: u128 = 1000000007;
+
+fn solve(n: u128, memory: &mut HashMap<u128, u128>) -> u128 {
+    if n == 0 {
+        return 1;
+    } else if n == 1 {
+        return 2;
+    }
+
+    if let Some(res) = memory.get(&n) {
+        return *res;
+    }
+    
+    if n % 2 == 0 {
+        let res = (2 * solve(n / 2 - 1, memory) + solve(n / 2, memory)) % MOD;
+        memory.insert(n, res);
+        return res;
+    } else {
+        let res = (2 * solve(n / 2, memory) + solve(n / 2 - 1, memory)) % MOD;
+        memory.insert(n, res);
+        return res;
+    }
+}
+
+fn main() {
+    input! {
+        n: u128,
+    };
+
+    let mut memory = HashMap::new();
+    let result = solve(n, &mut memory);
+
+    println!("{}", result);
 }