finish 16

src/euler16/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "euler16"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rust-gmp = "*"

src/euler16/src/main.rs

@@ -0,0 +1,12 @@
+use gmp::mpz::Mpz;
+
+fn main() {
+    let x = Mpz::from(2);
+    let y = x.pow(1000);
+    let result: u128 = y
+        .to_string()
+        .chars()
+        .map(|c| c.to_digit(10).unwrap() as u128)
+        .sum();
+    println!("{result}");
+}