#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, m, t, i;
cin >> t;
while(t--)
{
cin >> n >> m;
n = n - m;
m--;
int cnt = 1, f = 1;
while(n > 0)
{
if(n >= m)
{
n = n - m;
cnt++;
}
else
{
f = 0;
break;
}
}
if(f == 1)
cout << cnt << "\n";
else
cout << "cannot do this" << "\n";
}
return 0;
}
using namespace std;
int main()
{
int n, m, t, i;
cin >> t;
while(t--)
{
cin >> n >> m;
n = n - m;
m--;
int cnt = 1, f = 1;
while(n > 0)
{
if(n >= m)
{
n = n - m;
cnt++;
}
else
{
f = 0;
break;
}
}
if(f == 1)
cout << cnt << "\n";
else
cout << "cannot do this" << "\n";
}
return 0;
}
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