struct Solution;
impl Solution {
fn xor_queries(mut arr: Vec<i32>, queries: Vec<Vec<i32>>) -> Vec<i32> {
let n = arr.len();
for i in 1..n {
arr[i] ^= arr[i - 1];
}
let mut res = vec![];
for query in queries {
let l = query[0] as usize;
let r = query[1] as usize;
let x = if l > 0 { arr[r] ^ arr[l - 1] } else { arr[r] };
res.push(x);
}
res
}
}
#[test]
fn test() {
let arr = vec![1, 3, 4, 8];
let queries = vec_vec_i32![[0, 1], [1, 2], [0, 3], [3, 3]];
let res = vec![2, 7, 14, 8];
assert_eq!(Solution::xor_queries(arr, queries), res);
let arr = vec![4, 8, 2, 10];
let queries = vec_vec_i32![[2, 3], [1, 3], [0, 0], [0, 3]];
let res = vec![8, 0, 4, 4];
assert_eq!(Solution::xor_queries(arr, queries), res);
}