Codeforces-1520E

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
#pragma GCC optimize("unroll-loops")
#pragma comment(linker, "/stack:200000000")

#include<bits/stdc++.h>

#define int long long
#define ull unsigned long long
#define vi vector<int>
#define vvl vector<vector<int>>
#define deql deque<int>
#define prquel priority_queue<int>
#define loop(i,n) for(int i=0;i<n;i++)
#define loopn(i,a,b) for(int i=a;i<=b;i++)
#define rloop(i,n) for(int i=(n-1);i>=0;i--)
#define sortv(a) sort(a.begin(),a.end())
#define sortvr(a) sort(a.rbegin(),a.rend())
#define verase(a) a.erase(unique(a.begin(),a.end()),a.end())
#define all(a) a.begin(),a.end()
#define dbg(x) cout<<#x<<" = "<<x<<"\n";
#define mp make_pair
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define endl "\n"
#define inf 2e18
using namespace std;

int MOD=1000000007;
int mod=998244353;
const int N=200050;
const int nn=1000050;
int fact[N]; // array to store values of factorial
bool prime[nn]; //array to store precalculated primes till 10^6
bool pow2(int x){if(x&&(!(x&(x-1)))) return true; else return false;}
template<class T> void _print(vector<T> v1){ cerr<<"[ "; for(T i:v1){_print(i);cerr<<" ";}cerr<<"]";}
template<class T> void _print(set<T> s1){ cerr<<"[ "; for(T i:s1){_print(i);cerr<<" ";}cerr<<"]";}
template<class T> void _print(map<T,T> m1){for(auto i:m1){cerr<<"[ "; _print(i.first);cerr<<" : ";_print(i.second);cerr<<" ]";cerr<<endl;}}
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
template<class T> T gcd(T a,T b){if(!a||!b)return a|b; unsigned shift=__builtin_ctz(a|b); a>>=__builtin_ctz(a); do{b>>=__builtin_ctz(b); if(a>b)swap(a,b);b-=a;}while(b); return a<<shift;}
template<class T> T lcm(T a,T b){ unsigned val=max(a,b)/gcd(a,b);val*=min(a,b);return val;}
int multiply(int x, int y){return (x * 1ll * y) % MOD;}
int power(int x, int y){int z = 1;while(y){if(y & 1) z = multiply(z, x);x = multiply(x, x);y >>= 1;}return z;}
int modInverse(int x){return power(x, MOD - 2);}
int divide(int x, int y){return multiply(x, modInverse(y));}
void cal_factorial(){fact[0] = 1;for(int i = 1; i < N; i++)fact[i] = multiply(fact[i - 1], i);}// function to calculate factorial upto N
void cal_primes(){memset(prime,true,sizeof(prime)); loopn(i,2,sqrt(nn)){ if(prime[i]==true){ for(int j=i*i;j<=nn;j+=i){prime[j]=false;}}}}
int nCr(int n, int k){return divide(fact[n], multiply(fact[k], fact[n - k]));}
vector<int>Intersection(vi &v1,vi &v2){vi v3;sort(all(v1));sort(all(v2));set_intersection(all(v1),all(v2),back_inserter(v3));return v3;}
vector<int>Union(vi &v1,vi&v2){vi v3;sort(all(v1));sort(all(v2));set_union(all(v1),all(v2),back_inserter(v3));return v3;}
void FASTIO(){ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);}
int dx[8]={0,1,0,-1,1,1,-1,-1}; //direction vectors
int dy[8]={1,0,-1,0,1,-1,-1,1}; //direction vectors


void solve(int t)
{
    int testcases=t;
    while(t--)
    {
        //cout<<"#"<<(testcases-t)<<" Test-Case: "<<endl;
        int n;cin>>n;
        string s;
        int sc=0;
        cin>>s;
        loop(i,n)
        if(s[i]=='*')
            sc++;

        vi l(n,0),r(n,0);
        int cnt=0;
        loop(i,n)
        {
            if(s[i]=='*')
            {
                cnt++;
                if(i!=0)
                    r[i]=r[i-1];
            }
            else
            {
                if(i!=0)
                    r[i]=(r[i-1]+cnt);
            }
        }

        cnt=0;
        rloop(i,n)
        {
            if(s[i]=='*')
            {
                cnt++;
                if(i!=(n-1))
                    l[i]=l[i+1];
            }
            else
            {
                if(i!=(n-1))
                    l[i]=(l[i+1]+cnt);
            }
        }

        if(sc<2)
            cout<<0<<endl;
        else
        {
            int ans=10000000000000000;
            loop(i,n)
            {
                ans=min(ans,l[i+1]+r[i]);
            }

            cout<<ans<<endl;
        }
    }
}

main()
{
    auto start=chrono::system_clock::now();
    {
        #ifndef ONLINE_JUDGE
            freopen("input.txt","r",stdin);
            freopen("output.txt","w",stdout);
        #endif
        FASTIO();
        int t=1;
        cin>>t;
        solve(t);
    }
    auto end=chrono::system_clock::now();
    chrono::duration<double> elapsed=end-start;
//  cout<<" Time taken: "<<elapsed.count()<<" sec";
    return 0;
}