add abc398c.rs

rchaser53 · rchaser53 · commit 3aed71c8a8ca · 2025-03-26T20:28:14.000+09:00
diff --git a/src/abc/abc398c.rs b/src/abc/abc398c.rs
@@ -0,0 +1,33 @@
+/** 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! {
+    n:usize,
+    a:[isize;n]
+  }
+
+  let mut map = HashMap::new();
+  for i in 0..n {
+    *map.entry(a[i]).or_insert(0) += 1;
+  }
+
+  let mut max = -1;
+  for (k, v) in map {
+    if v == 1 {
+      max = max.max(k);
+    }
+  }
+
+  for i in 0..n {
+    if a[i] == max {
+      println!("{}", i + 1);
+      return
+    }
+  }
+  println!("{max}");
+}
