Add problem 3158: Find the XOR of Numbers Which Appear Twice

Author: EFanZh

src/lib.rs

@@ -2111,6 +2111,7 @@ pub mod problem_3148_maximum_difference_score_in_a_grid;
 pub mod problem_3151_special_array_i;
 pub mod problem_3152_special_array_ii;
 pub mod problem_3153_sum_of_digit_differences_of_all_pairs;
+pub mod problem_3158_find_the_xor_of_numbers_which_appear_twice;
 pub mod problem_3350_adjacent_increasing_subarrays_detection_ii;
 
 #[cfg(test)]

src/problem_3158_find_the_xor_of_numbers_which_appear_twice/iterative.rs

@@ -0,0 +1,41 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl Solution {
+    pub fn duplicate_numbers_xor(nums: Vec<i32>) -> i32 {
+        let nums = nums.into_iter().map(i32::cast_unsigned).collect::<Vec<_>>();
+        let mut bits = 0_u64;
+
+        for &num in &nums {
+            bits |= 1 << num;
+        }
+
+        let mut xor = 0;
+
+        while bits != 0 {
+            let num = bits.trailing_zeros();
+
+            xor ^= num;
+            bits ^= 1 << num;
+        }
+
+        nums.iter().fold(xor, |xor, &num| xor ^ num).cast_signed()
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn duplicate_numbers_xor(nums: Vec<i32>) -> i32 {
+        Self::duplicate_numbers_xor(nums)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_3158_find_the_xor_of_numbers_which_appear_twice/mod.rs

@@ -0,0 +1,18 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn duplicate_numbers_xor(nums: Vec<i32>) -> i32;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [(&[1, 2, 1, 3] as &[_], 1), (&[1, 2, 3], 0), (&[1, 2, 2, 1], 3)];
+
+        for (nums, expected) in test_cases {
+            assert_eq!(S::duplicate_numbers_xor(nums.to_vec()), expected);
+        }
+    }
+}