add abc416c.rs

Author: rchaser53

src/abc/abc416c.rs

@@ -0,0 +1,47 @@
+/** 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::*;
+
+struct Helper {
+  arr: Vec<String>,
+  s: Vec<String>,
+  k: usize
+}
+
+impl Helper {
+  fn dfs(&mut self, arr: &mut Vec<String>) {
+    if arr.len() == self.k {
+      self.arr.push(arr.join(""));
+      return;
+    }
+
+    for i in 0..self.s.len() {
+      arr.push(self.s[i].clone());
+      self.dfs(arr);
+      arr.pop();
+    }
+  }
+}
+
+
+fn main() {
+  input! {
+    n:usize,
+    k:usize,
+    x:Usize1,
+    s:[String;n]
+  }
+
+  let mut helper = Helper {
+    arr: vec![],
+    s,
+    k
+  };
+  helper.dfs(&mut vec![]);
+
+  helper.arr.sort();
+  println!("{}", helper.arr[x]);
+}