add abc412c.rs

Author: rchaser53

src/abc/abc412c.rs

@@ -0,0 +1,54 @@
+/** THIS IS AN OUTPUT FILE. NOT EDIT THIS FILE DIRECTLY. **/
+use proconio::input;
+use proconio::marker::*;
+use std::marker::PhantomData;
+use std::cmp::*;
+use std::collections::*;
+
+fn main() {
+  input! {
+    t:usize
+  }
+
+  for _ in 0..t {
+    helper();
+  }
+}
+
+fn helper() {
+    let mut p = 0;
+    let mut result = 1;
+
+    input! {
+      n:usize,
+      s:[usize;n]
+    }
+
+    let mut success = true;
+    loop {
+      if 2 * s[p] >= s[n-1] {
+        result += 1;
+        break
+      }
+
+      match s
+      .iter()
+      .enumerate()
+      .filter(|&(_,&x)| x > s[p] && x <= 2 * s[p])
+      .max_by_key(|&(_,&x)| x) {
+        Some((i, _)) => {
+          p = i;
+          result += 1;
+        }
+        None => {
+          println!("-1");
+          success = false;
+          break
+        }
+      }
+    }
+
+    if success {
+      println!("{}", result);
+    }
+}