solutions: 40

src/bin/champernownes_constant.rs

@@ -0,0 +1,16 @@
+fn main() {
+    let mut string: String = "0.".to_string();
+    for i in 1..=185185 {
+        string.push_str(&i.to_string());
+    }
+    
+    let digits = vec![1, 10, 100, 1000, 10_000, 100_000, 1_000_000];
+    let mut multiplying: Vec<u32> = vec![];
+
+    for i in digits {
+        let digit = &string.chars().nth(i+1);
+        multiplying.push(digit.unwrap().to_digit(10).unwrap());
+    }
+
+    println!("{}", multiplying.iter().product::<u32>());
+}