각
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~cpp
#include<iostream>
using namespace std;
int sdd(int x, int y);
void main()
{
cout << " ~ " << endl;
int a, b;
cin >> a >> b;
cout << sdd(a,b);
}
int sdd(int x, int y)
{
return (x<3)?1:(y<2?1:(y==x?1:sdd(x-1,y)+sdd(x-1,y-1)));
}










