ͻ񻣼
Õâ¸öÎÊÌâ¼òµ¥À´Ëµ¾ÍÊÇ£ºÒª±»É¾³ýµÄÖ¸ÕëÖ¸ÏòµÄÊǵ¥¸ö¶ÔÏóÄØ£¬»¹ÊǶÔÏóÊý×飿ÕâÖ»ÓÐÄãÀ´¸æËßdelete¡£Èç¹ûÄãÔÚÓÃdeleteʱûÓÃÀ¨ºÅ£¬delete¾Í»áÈÏΪָÏòµÄÊǵ¥¸ö¶ÔÏ󣬷ñÔò£¬Ëü¾Í»áÈÏΪָÏòµÄÊÇÒ»¸öÊý×飺string *stringptr1 = new string; string *stringptr2 = new string[100]; ... delete stringptr1; /... ÔĶÁÈ«ÎÄ
ͻ񻣼
ÿһÌË´Ó´ýÅÅÐòµÄÊý¾ÝÔªËØÖÐÑ¡³ö×îС£¨»ò×î´ó£©µÄÒ»¸öÔªËØ£¬Ë³Ðò·ÅÔÚÒÑÅźÃÐòµÄÊýÁеÄ×îºó£¬Ö±µ½È«²¿´ýÅÅÐòµÄÊý¾ÝÔªËØÅÅÍê¡£ Ñ¡ÔñÅÅÐòÊDz»Îȶ¨µÄÅÅÐò·½·¨¡£ n¸ö¼Ç¼µÄÎļþµÄÖ±½ÓÑ¡ÔñÅÅÐò¿É¾¹ýn-1ÌËÖ±½ÓÑ¡ÔñÅÅÐòµÃµ½ÓÐÐò½á¹û£º ¢Ù³õʼ״̬£ºÎÞÐòÇøΪR[1..n]£¬ÓÐÐòÇøΪ¿Õ¡£ ¢ÚµÚ1ÌËÅÅÐò ÔÚÎÞÐòÇøR[1..n]ÖÐÑ¡³ö¹Ø¼ü×Ö×îСµÄ¼Ç¼R[k]£¬½«ËüÓëÎÞÐòÇøµÄµÚ1¸ö¼Ç¼R[1]½»»»£¬Ê¹R[... ÔĶÁÈ«ÎÄ
ͻ񻣼
¿ìËÙÅÅÐòµÄ×Çé¿ö»ùÓÚÿ´Î»®·Ö¶ÔÖ÷ÔªµÄÑ¡Ôñ¡£»ù±¾µÄ¿ìËÙÅÅÐòÑ¡È¡µÚÒ»¸öÔªËØ×÷ΪÖ÷Ôª¡£ÕâÑùÔÚÊý×éÒѾÓÐÐòµÄÇé¿öÏ£¬Ã¿´Î»®·Ö½«µÃµ½×µÄ½á¹û¡£a56爆大奖在线娱乐±È½Ï³£¼ûµÄÓÅ»¯·½·¨ÊÇËæ»ú»¯Ëã·¨£¬¼´Ëæ»úÑ¡È¡Ò»¸öÔªËØ×÷ΪÖ÷Ôª¡£ÕâÖÖÇé¿öÏÂËäÈ»×Çé¿öÈÔÈ»ÊÇO(n^2)£¬µ«×Çé¿ö²»ÔÙÒÀÀµÓÚÊäÈëÊý¾Ý£¬¶øÊÇÓÉÓÚËæ»úº¯ÊýÈ¡Öµ²»¼Ñ¡£Êµ¼ÊÉÏ£¬Ëæ»ú»¯¿ìËÙÅÅÐòµÃµ½ÀíÂÛ×Çé¿öµÄ¿ÉÄÜÐÔ½öΪ1/(2^n)¡£a56爆大奖在线娱乐Ëæ»ú»¯¿ìËÙÅÅÐò¿ÉÒÔ¶ÔÓÚ¾ø´ó¶àÊýÊä... ÔĶÁÈ«ÎÄ
ͻ񻣼
½»»»ÅÅÐòµÄ»ù±¾Ë¼ÏëÊÇ£ºÁ½Á½±È½Ï´ýÅÅÐò¼Ç¼µÄ¹Ø¼ü×Ö£¬·¢ÏÖÁ½¸ö¼Ç¼µÄ´ÎÐòÏ෴ʱ¼´½øÐн»»»£¬Ö±µ½Ã»Óз´ÐòµÄ¼Ç¼Ϊֹ¡£ Ó¦Óý»»»ÅÅÐò»ù±¾Ë¼ÏëµÄÖ÷ÒªÅÅÐò·½·¨ÓУºÃ°ÅÝÅÅÐòºÍ¿ìËÙÅÅÐò¡£ ðÅÝÅÅÐò 1¡¢ÅÅÐò·½·¨ ½«±»ÅÅÐòµÄ¼Ç¼Êý×éR[1..n]´¹Ö±ÅÅÁУ¬a56爆大奖在线娱乐¼Ç¼R¿´×÷ÊÇÖØÁ¿ÎªR.keyµÄÆøÅÝ¡£¸ù¾ÝÇáÆøÅݲ»ÄÜÔÚÖØÆøÅÝ֮ϵÄÔÔò£¬´ÓÏÂÍùÉÏɨÃèÊý×éR£º·²É¨Ã赽Υ·´±¾ÔÔòµÄÇáÆøÅÝ£¬¾ÍʹÆäÏòÉÏ"Æ®¸¡... ÔĶÁÈ«ÎÄ
ͻ񻣼
Unlike stored procedures (which are simply stored SQL statements), triggers are tied to individual tables. A trigger associated with INSERT operations on the Orders table will be executed only when... ÔĶÁÈ«ÎÄ
ͻ񻣼
Indexes are used to sort data logically to improve the speed of searching and sorting operations. The best way to understand indexes is to envision the index at the back of a book (this book, for ex... ÔĶÁÈ«ÎÄ
ͻ񻣼
To simplify complex operations (as seen in the previous example) by encapsulating processes into a single easy-to-use unit. To ensure data consistency by not requiring that a ... ÔĶÁÈ«ÎÄ
ͻ񻣼
You've already seen one use for views. Here are some other common uses: To reuse SQL statements. To simplify complex SQL operations. After the query is written, it can be reu... ÔĶÁÈ«ÎÄ
ͻ񻣼
Now suppose that you had multiple catalog items created by the same vendor. Where would you store the vendor information (things like vendor name, address, and contact information)? You wouldn't wan... ÔĶÁÈ«ÎÄ
ͻ񻣼
mapµÄ»ù±¾Ó÷¨:Èç²åÈë¡¢²éÕÒ¡¢É¾³ý¡¢±éÀúµÈµÈ£¬Í¬Ê±¸æËßÄãÈçºÎʵÏÖË«¼ümap£¬°üÀ¨ (1) Ö»ÓÐÁ½¸ö¼ü¶¼Æ¥Åä²ÅÃüÖÐÄ¿±ê (2) Á½¸ö¼üÖÐÈa56爆大奖在线娱乐âÒ»¸öÆ¥Åä¾ÍÃüÖÐÄ¿±ê ¿ÉÒÔÀ©Õ¹µ½¶à¼ü (Ò») ½éÉÜ Ìص㣺 1.map½«KeyµÄobjectºÍTµÄObject°ó¶¨µ½Ò»Æð£¬Òò´ËÊÇa56爆大奖在线娱乐Pair Associative Container, a56爆大奖在线娱乐Æävalue typeΪ pair¡£ 2.ËüͬʱҲÊÇUnique A... ÔĶÁÈ«ÎÄ