#include <iostream>
#include <vector>

bool validate_arithmetic(const std::vector<bool>& bucket) {
    if (bucket.size() <= 1) { return false; }
    int previous_idx = -1, distance = -1;
    for (int i = 0; i < bucket.size(); i++) {
        if (!bucket[i]) { continue; }
        if (previous_idx == -1) {
            previous_idx = i;
            continue;
        }
        if (distance == -1) {
            distance = i - previous_idx;
        }
        if (i - previous_idx != distance) {
            return false;
        }
        previous_idx = i;
    }
    return true;
}

int clac_ans(const std::vector<int>& nums) {
    if (nums.size() == 1) { return 0; }
    std::vector<bool> bucket_begin(nums.size(), false);
    std::vector<bool> bucket_end(nums.size(), true);

    int ans = 0;
    for (int i = 0; i < nums.size(); i++) {
        bucket_begin[nums[i]] = true;
        bucket_end[nums[i]] = false;
        if (validate_arithmetic(bucket_begin) && validate_arithmetic(bucket_end)) {
            ans++;
            std::clog << i << std::endl;
        }
    }
    return ans - 1;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int n;
    std::cin >> n;
    while (std::cin >> n) {
        std::vector<int> nums(n);
        for (int i = 0; i < n; i++) { std::cin >> nums[i], nums[i]--; }
        std::cout << clac_ans(nums) << std::endl;
    }

    return 0;
}