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空间一维的01背包,内详,转移方程 for( int i=1 ; i<=N; i++)
{
if( a[ i ]>0 )
for( int j=MAX-1 ; j>=a[ i ] ; j--)
f[ j ]=max( f[ j ] , f[ j-a[ i ] ]+b[ i ] );
else{
a[ i ]=-a[ i ];
for( int j=0 ; j+a[ i ]<MAX ; j++)
f[ j ]=max( f[ j ] , f[ j+a[ i ] ]+b[ i ] );
}
}
best=max( f[ i ]+i-MID , best );
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