#include <bits/stdc++.h>
using namespace std;
using ll = long long;
//#include <atcoder/modint>
//using namespace atcoder;
//using mint = modint998244353;
# define M_PI 3.14159265358979323846 /* pi */
#define watch(x) cout << (#x) << " is " << (x) << endl
//#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
//const int MOD = (1e9+7);
template < typename T = int > ostream& operator << (ostream &out, const vector < T > &v){
for (const T &x: v) out << x << ' ';
return out;
}
void printmat(const vector<vector<int>>& mat) {
for (auto row : mat) {
for (auto elem : row)
cout << elem << " ";
cout << "\n";
}
}
void printdq(const deque<int>& v) {
for (auto elem : v)
cout << elem << " ";
cout << endl;
}
void printv(const vector<int>& v) {
for (auto elem : v)
cout << elem << " ";
cout << "\n";
}
void printvll(const vector<ll>& v) {
for (auto elem : v)
cout << elem << " ";
cout << endl;
}
void printd(const deque<int>& v) {
for (auto elem : v)
cout << elem << " ";
cout << endl;
}
void printvp(const vector<pair<int,int>>& vp) {
for (auto pr : vp) {
cout << pr.first << " " << pr.second;
cout << "\n";
}
}
void printvs(const vector<set<int>>& vs) {
for (auto row : vs) {
for (auto elem : row)
cout << elem << ", ";
cout << endl;
}
}
void printht(const unordered_map<int, int>& ht) {
for (auto elem : ht)
cout << elem.first << " : " << elem.second << endl;
}
void printmp(const map<ll, ll>& ht) {
for (auto elem : ht)
cout << elem.first << " : " << elem.second << endl;
}
void printst(const set<int>& st) {
for (auto elem : st)
cout << elem << " ";
cout << endl;
}
bool isPrime(long long n) {
if (n <= 1)
return false;
if (n <= 3)
return true;
if (n % 2 == 0 || n % 3 == 0)
return false;
for (long long i = 5; i * i <= n; i = i + 6)
if (n % i == 0 || n % (i + 2) == 0)
return false;
return true;
}
map<long long, long long> primeFactors(long long n) {
map<long long, long long> ans;
while (n % 2 == 0) {
ans[2]++;
n = n/2;
}
for (long long i = 3; i*i <= (n); i = i + 2) {
while (n % i == 0) {
ans[i]++;
n = n/i;
}
}
if (n > 2)
ans[n]++;
return ans;
}
int find_f(const vector<int>& uf, int i) {
while (uf[i]!=i)
i = uf[i];
return i;
}
bool union_f(vector<int>& uf, vector<int>& sz, int a, int b) {
a = find_f(uf, a);
b = find_f(uf, b);
//cout << "a, b = " << a << ", " << b << endl;
if (a==b) return false;
if (sz[a] < sz[b]) {
//cout << "sz[a], sz[b] = " << sz[a] << ", " << sz[b] << endl;
//cout << "a, b = " << a << ", " << b << endl;
swap(a,b);
//cout << "a, b = " << a << ", " << b << endl;
}
sz[a] += sz[b];
uf[b] = a;
return true;
}
long long modexp(long long b, long long e, long long M) {
if (!e) return 1;
b %= M;
long long x = modexp(b * b % M, e / 2, M);
if (e % 2) {
return b * x % M;
} else {
return x;
}
}
ll gcdExtended(ll a, ll b, ll* x, ll* y) {
if (a == 0) {
*x = 0, *y = 1;
return b;
}
ll x1, y1;
ll gcd = gcdExtended(b % a, a, &x1, &y1);
*x = y1 - (b / a) * x1;
*y = x1;
return gcd;
}
ll modInverse(ll a, ll m) {
ll x, y, res=-1;
ll g = gcdExtended(a, m, &x, &y);
if (g != 1) {
//cout << "Inverse doesn't exist";
res = -1;
} else {
// m is added to handle negative x
res = (x % m + m) % m;
}
return res;
}
int lenOfLIS(vector<int>& v) {
int n = v.size(), len = 0;
vector<int> dp(n,0);
for (int num : v) {
int i = lower_bound(dp.begin(), dp.begin()+len, num) - dp.begin();
dp[i] = num;
if (i == len) {
len++;
}
}
return len;
}
const int MOD = 1e9 + 7;
struct mi {
int v; explicit operator int() const { return v; }
mi() { v = 0; }
mi(long long _v) : v(_v % MOD) { v += (v < 0) * MOD; }
};
mi& operator+=(mi& a, mi b) {
if ((a.v += b.v) >= MOD) a.v -= MOD;
return a;
}
mi& operator-=(mi& a, mi b) {
if ((a.v -= b.v) < 0) a.v += MOD;
return a;
}
mi operator+(mi a, mi b) { return a += b; }
mi operator-(mi a, mi b) { return a -= b; }
mi operator*(mi a, mi b) { return mi((long long) a.v * b.v); }
mi& operator*=(mi& a, mi b) { return a = a * b; }
mi pow(mi a, long long p) {
assert(p >= 0);
return p == 0 ? 1 : pow(a * a, p / 2) * (p & 1 ? a : 1);
}
mi inv(mi a) { assert(a.v != 0); return pow(a, MOD - 2); }
mi operator/(mi a, mi b) { return a * inv(b); }
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int T=1, caseIdx=0;
cin >> T;
while (T--) {
//caseIdx++;
ll n;
string s;
cin >> n >> s;
ll ans = (n*(n+1))/2;
for (int i=0; i<n; i++) {
map<char,int> mp;
int mx = 0;
for (int len=1; len<=100; len++) {
if (i+len-1>=n)
break;
mp[s[i+len-1]]++;
mx = max(mx, mp[s[i+len-1]]);
if (mx>mp.size())
ans--;
}
}
//cout << fixed << setprecision(9);
cout << ans << "\n";
//cout << "Case #" << caseIdx << ": " << ans << "\n";
}
}