{"rsdb":{"rid":"345824","subhead":"","postdate":"0","aid":"246381","fid":"92","uid":"1","topic":"1","content":"
\n

\u6587\u7ae0\u8f6c\u8f7d\u81ea:http:\/\/www.python<\/a>heidong.com\/blog\/article\/2880\/<\/a><\/p> \n 

\u5251\u6307Offer - \u4e5d\u5ea61506 - \u6c421+2+3+...+n<\/strong><\/a>
2013-11-29 19:22<\/pre> \n 
\n  
\n   \u9898\u76ee\u63cf\u8ff0\uff1a<\/strong>\n  <\/dt>\n  
 \n   
\u6c421+2+3+...+n\uff0c\u8981\u6c42\u4e0d\u80fd\u4f7f\u7528\u4e58\u9664\u6cd5\u3001for\u3001while\u3001if\u3001else\u3001switch\u3001case\u7b49\u5173\u952e\u5b57\u53ca\u6761\u4ef6\u5224\u65ad\u8bed\u53e5\uff08A?B:C\uff09\u3002<\/p> \n  <\/dd>\n <\/dl>\n 
\n  
\n   \u8f93\u5165\uff1a<\/strong>\n  <\/dt>\n  
 \n   
\u8f93\u5165\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u6d4b\u8bd5\u6837\u4f8b\u3002
\u5bf9\u4e8e\u6bcf\u4e2a\u6d4b\u8bd5\u6848\u4f8b\uff0c\u8f93\u5165\u4e3a\u4e00\u4e2a\u6574\u6570n(1<= n<=100000)\u3002<\/p> \n  <\/dd>\n <\/dl>\n 
\n  
\n   \u8f93\u51fa\uff1a<\/strong>\n  <\/dt>\n  
 \n   
\u5bf9\u5e94\u6bcf\u4e2a\u6d4b\u8bd5\u6848\u4f8b\uff0c
\u8f93\u51fa1+2+3+\u2026+n\u7684\u503c\u3002<\/p> \n  <\/dd>\n <\/dl>\n 
\n  
\n   \u6837\u4f8b\u8f93\u5165\uff1a<\/strong>\n  <\/dt>\n  
 \n   
3\r\n5\r\n<\/pre> \n  <\/dd>\n <\/dl>\n 
\n  
\n   \u6837\u4f8b\u8f93\u51fa\uff1a<\/strong>\n  <\/dt>\n  
 \n   
6\r\n15<\/pre> \n  <\/dd>\n <\/dl> \n 
\u9898\u610f\u5206\u6790\uff1a<\/strong>
\u3000\u3000\u7ed9\u5b9a\u6b63\u6574\u6570n\uff0c\u8303\u56f4\u4e0d\u8d85\u8fc7100000\uff0c\u6c421 + ... + n\u7684\u548c\uff0c\u90a3\u4e48\u4e5f\u5c31\u662f\u6c42n * (n + 1) \/ 2\u7684\u503c\uff0c\u4f46\u662f\uff1a\u4e0d\u51c6\u7528\u4e58\u9664\u6cd5\u548c\u5faa\u73af\u4e4b\u7c7b\u7684\u5199\u6cd5\u3002\u6ce8\u610f\uff1a\u53ef\u4ee5\u7528\u52a0\u6cd5<\/strong>\u3002
\u3000\u3000\u5f88\u660e\u663e\uff0c\u4e0d\u51c6\u7528\u5faa\u73af\u7684\u8bdd\uff0c\u8981\u4e48\u91cd\u590d\u5199N\u904d\uff0c\u8981\u4e48\u9012\u5f52\u3002\u4e0d\u51c6\u6211\u7528\u4e58\u9664\uff0c\u5c31\u7528\u4f4d\u64cd\u4f5c\u6a21\u62df\u4e58\u9664\u3002\u867d\u7136\u6bd5\u4e1a\u540e\u5c31\u518d\u6ca1\u63a5\u89e6\u8fc7Verilog\u548c\u52a0\u6cd5\u5668\u4e58\u6cd5\u5668\uff0c\u4f46\u5b66\u5230\u7684\u8bbe\u8ba1\u601d\u60f3\u51b3\u4e0d\u80fd\u5fd8\u4e86\uff0c\u5426\u5219\u5b66\u8d39\u4e0d\u767d\u4ea4\u4e86\u5417\uff1f
\u3000\u3000\u6ce8\u610f\u4e0b\u9762\u4fe9\u5f0f\u5b50\uff1a
\u3000\u3000\u3000\u3000x^a * x^b = x^(a + b)
\u3000\u3000\u3000\u3000(a[n] * x^n + a[n - 1] * x^(n - 1) + ... + a[0]) * (b[m] * x^m + b[m - 1] * x^(m - 1) + ... + b[0]) = \u4e24\u4e24\u76f8\u4e58\u4e00\u5927\u5806
\u3000\u3000\u65e2\u7136\u8ba1\u7b97\u673a\u4e2d\u4e8c\u8fdb\u5236\u64cd\u4f5c\u8fd9\u4e48\u65b9\u4fbf\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u4e00\u4e2a\u6570\u6309\u4e8c\u8fdb\u5236\u5c55\u5f00\uff1a14 = 2^3 + 2^2 + 2^1\uff0c\u4e8e\u662f\u4e24\u4e2a\u6570\u76f8\u79f0\u5c31\u6210\u4e86\u4e24\u4e2ax=2\u7684\u591a\u9879\u5f0f\u76f8\u4e58\u4e86\u3002
\u3000\u3000\u63a5\u4e0b\u6765\uff0c2^a * 2^b = 2^(a + b) = 1 << (a + b)
\u3000\u3000\u6709\u4e86\u4e0a\u9762\u7684\u601d\u8def\uff0c\u6211\u4eec\u8003\u8651\u6574\u6570a * b\uff0c\u5982\u679ca\u548cb\u90fd\u662f32\u4f4d\u6574\u6570\uff0c\u90a3\u4e48a\u7684\u6240\u6709\u4e8c\u8fdb\u5236\u4f4d\u548cb\u7684\u6240\u6709\u4e8c\u8fdb\u5236\u4f4d\u4e58\u79ef\u7684\u548c\u3002\u63a5\u4e0b\u6765\u5c31\u53c2\u8003Verilog\u4e2d\u7684\u5e38\u89c4\u5199\u6cd5\u4e86\uff1a
\u3000\u3000\u7b2c\u4e00\u5c42\u201c\u5faa\u73af\u201d\uff0c<\/strong>fun1()\uff1a
\u3000\u3000\u3000\u3000fun1(0);
\u3000\u3000\u3000\u3000fun1(1);
\u3000\u3000\u3000\u3000...
\u3000\u3000\u3000\u3000fun1(31);
\u3000\u3000
\u3000\u3000\u7b2c\u4e8c\u5c42\u5faa\u73af\uff0c<\/strong>\u5728fun1\u4e2d\u518d\u8c03\u7528\u591a\u4e2afun2()\uff1a
\u3000\u3000\u3000\u3000fun2(0);
\u3000\u3000\u3000\u3000fun2(1);
\u3000\u3000\u3000\u3000...
\u3000\u3000\u3000\u3000fun2(31);
\u3000\u3000Verilog\u91cc\u4e0d\u5efa\u8bae\u7528for\u5faa\u73af\u662f\u6709\u539f\u56e0\u7684\uff0c\u6bd5\u7adf\u7535\u8def\u8bbe\u8ba1\u548c\u5199\u8f6f\u4ef6\u4e0d\u4e00\u6837\uff0c\u5177\u4f53\u539f\u56e0\u53ef\u81ea\u884c\u767e\u5ea6\u201cVerilog for<\/strong>\u201d\u3002\u4f46\u8fd9\u79cd\u5199\u6cd5\u8fd8\u771f\u53ef\u4ee5\u907f\u514d\u4f7f\u7528\u5faa\u73af\uff0c\u6ee1\u8db3\u9762\u8bd5\u9898\u7684\u8981\u6c42\u3002
\u3000\u3000\u6700\u540e\u8fd8\u6709\u4e24\u70b9\uff1a
\u3000\u3000\u3000\u30001. \u9898\u76ee\u4e2dn\u7684\u8303\u56f4\u4e0d\u8d85\u8fc7\u5341\u4e07\uff0c\u56e0\u6b64\u4e8c\u8fdb\u5236\u4f4d\u6570\u4e0d\u8d85\u8fc717\u4f4d\uff0c\u5faa\u73af\u519917\u4e2a\u5176\u5b9e\u5c31\u591f\u4e86\u3002
\u3000\u3000\u3000\u30002. \u7ed3\u679c\u8303\u56f4\u660e\u663e\u53ef\u4ee5\u8d85\u51faint\u8303\u56f4\uff0c\u7528long long int\u5427\u3002<\/pre> \n 
 \n  
 1<\/span> \/\/<\/span> 653472    zhuli19901106    1506    Accepted    \u70b9\u51fb\u6b64\u5904\u67e5\u770b\u6240\u6709case\u7684\u6267\u884c\u7ed3\u679c    1020KB    1606B    50MS\r\n<\/span> 2<\/span> \/\/<\/span> 201311190134<\/span>\r\n 3<\/span> #include <cstdio>\r\n 4<\/span> using<\/span> namespace<\/span> std;\r\n<\/span> 5<\/span> \r\n 6<\/span> void<\/span> add2(long<\/span> long<\/span> int<\/span> &x, long<\/span> long<\/span> int<\/span> &y, int<\/span> i, int<\/span> j, long<\/span> long<\/span> int<\/span> &res)\r\n<\/span> 7<\/span> {\r\n<\/span> 8<\/span>     res += (((!!(x & (1<\/span> << i))) & (!!(y & (1<\/span> << j)))) << (i + j));\r\n<\/span> 9<\/span> }\r\n<\/span>10<\/span> \r\n11<\/span> void<\/span> add1(long<\/span> long<\/span> int<\/span> &x, long<\/span> long<\/span> int<\/span> &y, int<\/span> i, long<\/span> long<\/span> int<\/span> &res)\r\n<\/span>12<\/span> {\r\n<\/span>13<\/span>     add2(x, y, i, 0<\/span>, res);\r\n<\/span>14<\/span>     add2(x, y, i, 1<\/span>, res);\r\n<\/span>15<\/span>     add2(x, y, i, 2<\/span>, res);\r\n<\/span>16<\/span>     add2(x, y, i, 3<\/span>, res);\r\n<\/span>17<\/span>     add2(x, y, i, 4<\/span>, res);\r\n<\/span>18<\/span>     add2(x, y, i, 5<\/span>, res);\r\n<\/span>19<\/span>     add2(x, y, i, 6<\/span>, res);\r\n<\/span>20<\/span>     add2(x, y, i, 7<\/span>, res);\r\n<\/span>21<\/span>     add2(x, y, i, 8<\/span>, res);\r\n<\/span>22<\/span>     add2(x, y, i, 9<\/span>, res);\r\n<\/span>23<\/span>     add2(x, y, i, 10<\/span>, res);\r\n<\/span>24<\/span>     add2(x, y, i, 11<\/span>, res);\r\n<\/span>25<\/span>     add2(x, y, i, 12<\/span>, res);\r\n<\/span>26<\/span>     add2(x, y, i, 13<\/span>, res);\r\n<\/span>27<\/span>     add2(x, y, i, 14<\/span>, res);\r\n<\/span>28<\/span>     add2(x, y, i, 15<\/span>, res);\r\n<\/span>29<\/span>     add2(x, y, i, 16<\/span>, res);\r\n<\/span>30<\/span>     add2(x, y, i, 17<\/span>, res);\r\n<\/span>31<\/span>     add2(x, y, i, 18<\/span>, res);\r\n<\/span>32<\/span>     add2(x, y, i, 19<\/span>, res);\r\n<\/span>33<\/span> }\r\n<\/span>34<\/span> \r\n35<\/span> int<\/span> main()\r\n<\/span>36<\/span> {\r\n<\/span>37<\/span>     long<\/span> long<\/span> int<\/span> n;\r\n<\/span>38<\/span>     long<\/span> long<\/span> int<\/span> res;\r\n<\/span>39<\/span>     long<\/span> long<\/span> int<\/span> x, y;\r\n<\/span>40<\/span>     \r\n41<\/span>     while<\/span>(scanf("<\/span>%lld<\/span>"<\/span>, &n) == 1<\/span>){\r\n<\/span>42<\/span>         res = 0<\/span>;\r\n<\/span>43<\/span>         x = n;\r\n<\/span>44<\/span>         y = n + 1<\/span>;\r\n<\/span>45<\/span>         add1(x, y, 0<\/span>, res);\r\n<\/span>46<\/span>         add1(x, y, 1<\/span>, res);\r\n<\/span>47<\/span>         add1(x, y, 2<\/span>, res);\r\n<\/span>48<\/span>         add1(x, y, 3<\/span>, res);\r\n<\/span>49<\/span>         add1(x, y, 4<\/span>, res);\r\n<\/span>50<\/span>         add1(x, y, 5<\/span>, res);\r\n<\/span>51<\/span>         add1(x, y, 6<\/span>, res);\r\n<\/span>52<\/span>         add1(x, y, 7<\/span>, res);\r\n<\/span>53<\/span>         add1(x, y, 8<\/span>, res);\r\n<\/span>54<\/span>         add1(x, y, 9<\/span>, res);\r\n<\/span>55<\/span>         add1(x, y, 10<\/span>, res);\r\n<\/span>56<\/span>         add1(x, y, 11<\/span>, res);\r\n<\/span>57<\/span>         add1(x, y, 12<\/span>, res);\r\n<\/span>58<\/span>         add1(x, y, 13<\/span>, res);\r\n<\/span>59<\/span>         add1(x, y, 14<\/span>, res);\r\n<\/span>60<\/span>         add1(x, y, 15<\/span>, res);\r\n<\/span>61<\/span>         add1(x, y, 16<\/span>, res);\r\n<\/span>62<\/span>         add1(x, y, 17<\/span>, res);\r\n<\/span>63<\/span>         add1(x, y, 18<\/span>, res);\r\n<\/span>64<\/span>         add1(x, y, 19<\/span>, res);\r\n<\/span>65<\/span>         res >>= 1<\/span>;\r\n<\/span>66<\/span>         printf("<\/span>%lld\\n<\/span>"<\/span>, res);\r\n<\/span>67<\/span>     }\r\n<\/span>68<\/span> \r\n69<\/span>     return<\/span> 0<\/span>;\r\n<\/span>70<\/span> }<\/pre> \n <\/div> \n 
 <\/p> \n 
\u6587\u7ae0\u8f6c\u8f7d\u81ea:http:\/\/www.python<\/a>heidong.com\/blog\/article\/2880\/<\/a><\/p> \n<\/div>","orderid":"0","title":"\u5251\u6307Offer - \u4e5d\u5ea61506 - \u6c421+2+3+...+n","smalltitle":"","mid":"0","fname":"Verilog","special_id":"0","bak_id":"0","info":"0","hits":"198","pages":"1","comments":"0","posttime":"2019-09-03 02:39:54","list":"1567449594","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"\u5251\u6307<\/A> Offer<\/A> \u4e5d\u5ea6<\/A> 1506<\/A> ...<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"120.229.33.54","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u5251\u6307Offer - \u4e5d\u5ea61506 - \u6c421+2+3+...+n","lastview":"1713366446","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}