For problem statement at 1000-1999/1700-1799/1710-1719/1718/problemA2.txt this is a correct solution, but verifier at 1000-1999/1700-1799/1710-1719/1718/verifierA2.go ends with All 96 tests passed.

validated 20/96 tests...
validated 40/96 tests...
validated 60/96 tests...
validated 80/96 tests... can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var t int
	if _, err := fmt.Fscan(in, &t); err != nil {
		return
	}

	for i := 0; i < t; i++ {
		var n int
		fmt.Fscan(in, &n)

		ans := 0
		cur := 0
		seen := make(map[int]struct{})
		seen[0] = struct{}{}

		for j := 0; j < n; j++ {
			var a int
			fmt.Fscan(in, &a)
			cur ^= a
			if _, ok := seen[cur]; ok {
				ans++
				seen = make(map[int]struct{})
				seen[0] = struct{}{}
				cur = 0
			} else {
				seen[cur] = struct{}{}
			}
		}
		fmt.Fprintln(out, n-ans)
	}
}