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#include <iostream> using namespace std; int main() { int a,b,c[100000],d=0; cin >> a; for(int i=0; i<a;i++){ cin >> b; if(b%2==0){ d = ceil((b/2)-1); } else{ d = ceil(b/2); } c[i]=d; } for(int i=0; i<a;i++){ cout << c[i] << endl; } }