053 ok

053/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "hello_053"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+num-bigint = "0.4.4"
+num-traits = "0.2.17"

053/src/main.rs

@@ -0,0 +1,34 @@
+use num_bigint::BigUint;
+use num_traits::{Zero, One};
+
+// Calculate large fibonacci numbers.
+fn fc(n: usize) -> BigUint {
+    let mut nn = n;
+    let mut res: BigUint = One::one();
+
+    while nn > 1 {
+        res *= nn;
+        nn-=1;
+    }
+
+    return res;
+}
+
+fn bn(n: usize, r: usize) -> BigUint {
+    return fc(n) / (fc(r) * fc(n-r));
+}
+
+
+fn main() {
+    //println!("Hello, world!");
+    //println!("fib(1000) = {}", fib(1000));
+    let mut count = 0;
+    for n in 1..=100 {
+        for r in 1..=n {
+            if bn(n, r) > BigUint::from(1000000u32) {
+                count +=1;
+            }
+        }
+    }
+    println!("{}", count);
+}