init

problems/p125/src/main.rs

@@ -0,0 +1,57 @@
+use rayon::prelude::*;
+
+fn is_palindromic_number(n: u64) -> bool {
+    let str_n = n.to_string();
+    let rev_str_n: String = str_n.chars().rev().collect();
+    if str_n == rev_str_n {
+        return true;
+    }
+    false
+}
+
+fn is_continue_square_sum(n: u64) -> bool {
+    for start in 1..=(n as f64).sqrt() as u64 {
+        let mut sum = 0;
+        let mut count = 0;
+        let mut k = start;
+
+        while sum < n {
+            sum += k * k;
+            count += 1;
+            k += 1;
+
+            if sum == n && count >= 2 {
+                // 至少2个连续数字
+                return true;
+            }
+        }
+    }
+    false
+}
+
+fn main() {
+    assert!(is_palindromic_number(595));
+    assert!(is_continue_square_sum(595));
+    // let mut sum = 0u64;
+    // for i in 2..100000000u64 {
+    //     if !is_palindromic_number(i) {
+    //         continue;
+    //     }
+    //     if !is_continue_square_sum(i) {
+    //         continue;
+    //     }
+    //     sum += i;
+    // }
+    // let sum: u64 = (2..100000000u64)
+    //     .filter(|&i| is_palindromic_number(i))
+    //     .filter(|&i| is_continue_square_sum(i))
+    //     .sum();
+
+    let sum: u64 = (2..100000000u64)
+        .into_par_iter()
+        .filter(|&i| is_palindromic_number(i))
+        .filter(|&i| is_continue_square_sum(i))
+        .sum();
+
+    println!("{sum}");
+}