solutions: 25A

README.md

@@ -61,5 +61,6 @@ My set of solutions to the problems on Code Forces.
 - [58A Chat room](https://codeforces.com/problemset/problem/58/A)
 - [43A Football](https://codeforces.com/problemset/problem/43/A)
 - [34B Sale](https://codeforces.com/problemset/problem/34/B)
+- [25A IQ test](https://codeforces.com/problemset/problem/25/A)
 - [4A Watermelon](https://codeforces.com/problemset/problem/4/A)
 - [1A Theatre Square](https://codeforces.com/problemset/problem/1/A)

solutions/rust/src/bin/25A.rs

@@ -0,0 +1,27 @@
+use std::io;
+
+fn main() {
+    let mut s = String::new();
+    io::stdin().read_line(&mut s).unwrap();
+
+    let mut s = String::new();
+    io::stdin().read_line(&mut s).unwrap();
+    let a: Vec<u64> = s.split_whitespace().map(|d| d.parse::<u64>().unwrap()).collect();
+
+    let mut evenness = vec![];
+    for i in a {
+        if i % 2 == 0 {
+            evenness.push(0);
+        } else {
+            evenness.push(1);
+        }
+    }
+
+    let odds = evenness.iter().filter(|&n| *n == 1).count();
+
+    if odds == 1 {
+        println!("{}", evenness.iter().position(|&n| n == 1).unwrap()+1);
+    } else {
+        println!("{}", evenness.iter().position(|&n| n == 0).unwrap()+1);
+    }
+}