arc134 b

arc134/src/bin/b.rs

@@ -1,10 +1,33 @@
-use proconio::{input, marker::Usize1};
+use std::{cmp::Reverse, collections::BinaryHeap};
+
+use proconio::{input, marker::Chars};
 
 fn main() {
     input! {
         n: usize,
-        a: [Usize1; n],
+        s: Chars,
     };
-    let ans = n - a.len();
-    println!("{}", ans);
+
+    let mut pq = BinaryHeap::new();
+    for (i, s_i) in s.iter().copied().enumerate() {
+        pq.push((Reverse(s_i), i));
+    }
+
+    let mut r = n;
+    let mut ans = s.clone();
+    for (l, s_l) in s.iter().copied().enumerate() {
+        while let Some((Reverse(s_j), j)) = pq.pop() {
+            if j < l || r <= j {
+                continue;
+            }
+            if s_j < s_l {
+                r = j;
+                ans.swap(l, r);
+            } else {
+                pq.push((Reverse(s_j), j));
+            }
+            break;
+        }
+    }
+    println!("{}", ans.iter().collect::<String>());
 }