feat: add initial implementation of Cargo.toml, Cargo.lock, and lib.rs with subset_xor_sum function

1863_sum_of_all_subset_xor_totals/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "sum_of_all_subset_xor_totals"
+version = "0.1.0"

1863_sum_of_all_subset_xor_totals/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "sum_of_all_subset_xor_totals"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

1863_sum_of_all_subset_xor_totals/src/lib.rs

@@ -0,0 +1,8 @@
+pub struct Solution;
+
+impl Solution {
+    pub fn subset_xor_sum(nums: Vec<i32>) -> i32 {
+        let or_sum = nums.iter().fold(0, |acc, &num| acc | num);
+        or_sum << (nums.len() - 1)
+    }
+}