Create 2566_maximum_difference_by_remapping_a_digit.rs

Author: dirdr

rust/easy/2566_maximum_difference_by_remapping_a_digit.rs

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+impl Solution {
+    pub fn min_max_difference(num: i32) -> i32 {
+        let decompose_digits = |mut a: i32| {
+            let mut digits = vec![];
+            while a > 0 {
+                digits.push(a % 10);
+                a /= 10;
+            }
+            digits
+        };
+
+        let mut digits = decompose_digits(num);
+        digits.reverse();
+
+        let (min_remap, mut max_remap) = (digits[0], -1);
+        for &d in &digits {
+            if d != 9 {
+                max_remap = d;
+                break;
+            }
+        }
+
+        let mut mul = 1;
+        let (mut a, mut b) = (0, 0);
+        let mut diff = 0;
+        for &digit in digits.iter().rev() {
+            let a = if digit == max_remap { 9 } else { digit };
+            let b = if digit == min_remap { 0 } else { digit };
+            diff += (a - b) * mul;
+            mul *= 10;
+        }
+        diff
+    }
+}