complete 2083.rs 2530.rs 2721.rs 4128.rs 5584.rs 7512.rs 21519.rs 21964.rs 22862.rs 22973.rs 24123.rs 26993.rs 27514.rs 33849.rs

storage/zeta/rs/completed/22973.rs

@@ -0,0 +1,26 @@
+use std::io::{read_to_string, stdin};
+
+fn main() {
+    let k = read_to_string(stdin())
+        .unwrap()
+        .trim()
+        .parse::<i64>()
+        .unwrap();
+
+    let k = k.abs() as u64;
+    if k == 0 {
+        println!("{}", 0);
+    }
+    else if k % 2 == 0 {
+        println!("{}", -1);
+    } else {
+        let mut max_i = 48;
+        for i in 0..=48 {
+            if k >> i == 0 {
+                max_i = i;
+                break;
+            }
+        }
+        println!("{}", max_i);
+    }
+}