# Yuki 355 数当てゲーム(2) ( Hit & Blow )

No.355 数当てゲーム(2) - yukicoder

Hit & Blow と呼ぶらしい ( ? )

```#include <bits/stdc++.h>
using namespace std;

signed main(){
set< tuple< int, int, int, int > > cand;
for( int i = 0; i < 10; ++i )
for( int j = 0; j < 10; ++j ) if( j != i )
for( int k = 0; k < 10; ++k ) if( k != i and k != j )
for( int l = 0; l < 10; ++l ) if( l != i and l != j and l != k )
cand.emplace( i, j, k, l );
while( not cand.empty() ){
int a, b, c, d; tie( a, b, c, d ) = *cand.begin();
cout << a << " " << b << " " << c << " " << d << endl;
int x, y; cin >> x >> y; // exactly same / different pos but has
if( x == 4 and y == 0 )
exit( 0 );
set< tuple< int, int, int, int > > ncand;
for( auto it = cand.begin(); it != cand.end(); ++it ){
int sx = 0, sy = 0;
int e, f, g, h; tie( e, f, g, h ) = *it;
sx = ( a == e ) + ( b == f ) + ( c == g ) + ( d == h );
if( a != e and ( a == f or a == g or a == h ) )
++sy;
if( b != f and ( b == e or b == g or b == h ) )
++sy;
if( c != g and ( c == e or c == f or c == h ) )
++sy;
if( d != h and ( d == e or d == f or d == g ) )
++sy;
if( sx == x and sy == y )
ncand.emplace( e, f, g, h );
}
swap( cand, ncand );
}
return 0;
}
```