init

problems/p112/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "p112"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rayon = "1.11.0"

problems/p112/src/main.rs

@@ -0,0 +1,32 @@
+fn is_bou_num(num: u32) -> bool {
+    if num < 100 {
+        return false;
+    }
+    let str_num = num.to_string().chars().collect::<Vec<_>>();
+    let prev_con = str_num[0] >= str_num[1];
+    for window in str_num.windows(2).skip(1) {
+        let a = window[0];
+        let b = window[1];
+        if prev_con != (a >= b) {
+            return true;
+        }
+    }
+    false
+}
+#[test]
+fn test() {
+    assert!(is_bou_num(155349));
+    assert!(!is_bou_num(123456));
+}
+
+fn main() {
+    let mut counter = 0;
+    for i in 0..=21780 {
+        if is_bou_num(i) {
+            counter += 1;
+        }
+    }
+    todo!();
+    let percentage = counter as f64 / 21780f64;
+    println!("{percentage}")
+}