complete 1547.rs 1609.rs

storage/zeta/rs/completed/1547.rs

@@ -0,0 +1,31 @@
+use std::io::{read_to_string, stdin};
+
+fn main() {
+    let temp = read_to_string(stdin()).unwrap();
+    let mut iter = temp
+        .split_ascii_whitespace()
+        .map(|x| x.parse::<usize>().unwrap());
+
+    let n = iter.next().unwrap();
+
+    let mut cups = vec![false; 3];
+    cups[0] = true;
+
+    (0..n).for_each(|_| {
+        let (x, y) = (iter.next().unwrap() - 1, iter.next().unwrap() - 1);
+
+        let temp = cups[y];
+        cups[y] = cups[x];
+        cups[x] = temp;
+    });
+    println!(
+        "{}",
+        if cups[0] {
+            1
+        } else if cups[1] {
+            2
+        } else {
+            3
+        }
+    )
+}