complete 4779.rs 32720.rs

storage/zeta/rs/completed/4779.rs

@@ -0,0 +1,32 @@
+use std::io::{read_to_string, stdin};
+
+fn cantor_string(line: &mut Vec<char>, lo: usize, n: usize) {
+    if n == 0 {
+        return;
+    }
+    let x = 3usize.pow(n as u32 - 1);
+    for i in lo + x..lo + 2 * x {
+        line[i] = ' ';
+    }
+    cantor_string(line, lo, n - 1);
+    cantor_string(line, lo + 2 * x, n - 1);
+}
+
+fn main() {
+    let temp = read_to_string(stdin()).unwrap();
+    let mut iter = temp
+        .split_ascii_whitespace()
+        .map(|x| x.parse::<usize>().unwrap());
+    loop {
+        let n = match iter.next() {
+            Some(n) => n,
+            None => {
+                break;
+            }
+        };
+        let x = 3usize.pow(n as u32);
+        let mut line = vec!['-'; x];
+        cantor_string(&mut line, 0, n);
+        println!("{}", line.iter().collect::<String>());
+    }
+}