Debug

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#define debug(a) cout << #a << " = " << a << endl;
#define debug2(a,b) cout<<#a<<" = "<<a<<' '<<#b<<" = "<<b<<endl;
#define debug3(a,b,c) cout<<#a<<" = "<<a<<' '<<#b<<" = "<<b<<' '<<#c<<" = "<<c<<endl;
#define debug4(a,b,c,d) cout<<#a<<" = "<<a<<' '<<#b<<" = "<<b<<' '<<#c<<" = "<<c<<' '<<#d<<" = "<<d<<endl;
#define debug5(a,b,c,d,e) cout<<#a<<" = "<<a<<' '<<#b<<" = "<<b<<' '<<#c<<" = "<<c<<' '<<#d<<" = "<<d<<' '<<#e<<" = "<<e<<endl;
#define debugx(a, idx) cout << #a << "[" << idx << "] = " << a[idx] << endl;
#define debugarr(a, x) for(int i = 0; i < x; i++) cout << a[i] << ' '; cout << endl;
#define debugvec(a) for(int i = 0; i < a.size(); i++) cout << a[i] << ' '; cout << endl;
#define debugarr2(a, n, m) cout<<#a<<": \n";for(int i=0;i<n;i++){for(int j=0;j<m;j++)cout<<a[i][j]<<' ';cout<<'\n';}