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typedef unsigned long long uLL;

uLL seed = 1;

void setSeed( uLL s )
{
        seed = s;
}

       
double nextDouble()  // ·µ»ØÏÂÒ»¸ö double ÐÍËæ»úÊý,·¶Î§ÊÇ 0 µ½ 1
{
        return ( ( ( uLL )next( 26 ) << 27 ) + next( 27 ) ) / 9007199254740992.0;  
}
       
int next( int bits )  // Éú³ÉÏÂÒ»¸öÎ±Ëæ»úÊý
{
      
        seed = ( seed * 25214903917L + 11L ) & 0xFFFFFFFFFFFF;
        return ( int ) ( seed >> ( 48 - bits ) );
}

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srand( time( NULL ) );  //ÖÖ×Óº¯Êý
rand();  //²úÉúËæ»úÊýµÄº¯Êý
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a = rand()/(RAND_MAX+1.0);
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