Codeforces-Atcoder/codeforces/1335/A.cpp at master · nabil0day/Codeforces-Atcoder · GitHub

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/*****
                                                     __Bismillahir Rahmanir Rahim__
                                               American International University Bangladesh (AIUB)
                                                          Hadiur Rahman Nabil


*****/
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector <int> vi;

#define INF 1000000007

#define pb push_back
#define mp make_pair
#define endl "\n"


int main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout.tie(NULL);


ll t,res=0,n;

cin>>t;
while(t--)
{
   cin>>n;
   res=(n-1)/2;
   cout<<res<<"\n";
}

return 0;

}