战略游戏

战略游戏

#include < iostream >
using   namespace  std;

int  N;
int  yes[ 1550 ],no[ 1550 ];
int  chd[ 3050 ],pre[ 3550 ],las[ 1550 ];
int  vis[ 1550 ];
inline  int  min( int  x, int  y){
     return  x > y ? y:x;
}
void  treedp( int  x){
    yes[x] = 1 ; no[x] = 0 ;
    vis[x] = 1 ;
     while (las[x]){
         int  y = chd[las[x]];
         if ( ! vis[y]){
            treedp(y);
            yes[x] += min(yes[y],no[y]);
            no[x] += yes[y];
        }
        las[x] = pre[las[x]];
    }
}
int  main()
{
    scanf( " %d " , & N);
     int  c = 0 ,x,y,k;
    memset(las, 0 , sizeof (las));
     for ( int  i = 1 ;i <= N; ++ i){
        scanf( " %d%d " , & x, & k);
         for ( int  j = 1 ;j <= k; ++ j){
            scanf( " %d " , & y);
             ++ c; pre[c] = las[x]; chd[c] = y; las[x] = c;
             ++ c; pre[c] = las[y]; chd[c] = x; las[y] = c;
        }
    }
    memset(vis, 0 , sizeof (vis));
    treedp( 0 );
    printf( " %d\n " ,min(yes[ 0 ],no[ 0 ]));
     return   0 ;
}