{"id":618,"date":"2020-01-20T00:22:10","date_gmt":"2020-01-19T16:22:10","guid":{"rendered":"http:\/\/www.mustenaka.cn\/?p=618"},"modified":"2020-01-20T11:32:42","modified_gmt":"2020-01-20T03:32:42","slug":"jianzhiofferquestion1plus2plusn","status":"publish","type":"post","link":"https:\/\/www.mustenaka.cn\/index.php\/2020\/01\/20\/jianzhiofferquestion1plus2plusn\/","title":{"rendered":"\u5251\u6307OFFER\u9898\u76ee\uff1a1+\u2026\u2026+n\uff0c\u4e0d\u9002\u7528\u6574\u9664\u548c\u5224\u65ad\u5faa\u73af\u7b49"},"content":{"rendered":"

\u9898\u76ee\uff1a\u6c421+2+\u2026\u2026+n\uff0c\u8981\u6c42\u4e0d\u80fd\u4f7f\u7528\u6574\u9664\u6cd5\uff0cfor\uff0cwhile\uff0cif\uff0celse\uff0cswitch\uff0ccase\u7b49\u5faa\u73af\u5173\u952e\u5b57\u53ca\u6761\u4ef6\u5224\u65ad\u8bed\u53e5\uff08A?B:C\uff09<\/p><\/blockquote>\n

\u548c\u51e0\u4e2a\u670b\u53cb\u8ba8\u8bba\u8fd9\u4e2a\u95ee\u9898\uff0c\u5dee\u4e0d\u591a\u6709\u5982\u4e0b\u89e3\u6cd5\uff1a<\/p>\n

1.\u679a\u4e3e+\u6a21\u677f\u7c7b\u65b9\u6cd5\uff1a<\/h1>\n
#include<iostream>\r\nusing namespace std;\r\n\r\ntemplate<int N>\r\nclass add{\r\n\tpublic:\r\n\t\tenum{\r\n\t\t\tvalue = add<N-1>::value+N\r\n\t\t};\r\n};\r\n\r\ntemplate<>\r\nclass add<1>{\r\n\tpublic:\r\n\t\tenum{\r\n\t\t\tvalue=1\r\n\t\t};\r\n};\r\n\r\nint main(){\r\n\tcout<<add<100>::value<<endl;\r\n\treturn 0;\r\n}<\/code><\/pre>\n
\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4f7f\u7528\u5728\u4e8e\u4f7f\u7528\u679a\u4e3e\u6784\u9020\u53c2\u6570value\uff0c\u89c4\u5b9a\u4e86\u4e00\u79cd\u53c2\u6570\u7684\u5f62\u5f0f\u4e3avalue+n\uff0cn\u4e3a\u6a21\u677f\u7c7b\u7684\u6784\u9020\u53c2\u6570\uff0c\u5f53\u6211\u4eec\u6784\u9020\u8fd9\u4e2a\u6a21\u677f\u7c7badd\u7684\u65f6\u5019\uff0c\u81ea\u52a8value\u8fdb\u884c\u8fd0\u7b97\uff0c\u6bcf\u4e00\u6b21\u8fd0\u7b97\u8fd8\u4f1a\u81ea\u52a8\u8c03\u7528\u3010\u9012\u5f52\u3011\u4e00\u6b21\u6a21\u677f\u7c7badd\uff0c\u7136\u540e\u6211\u4eec\u518d\u4eba\u4e3a\u7684\u89c4\u5b9a\u4e00\u4e2a\u6a21\u677f\u7c7b\u7684\u7279\u6b8a\u503c\uff0c\u4e5f\u5c31\u662f\u5f53add=1\u7684\u65f6\u5019\uff0cvalue\u7684\u503c\u5c31\u4e3a1\uff0c\u4e0d\u518d\u5411\u4e0b\u9012\u51cf\u3002<\/div>\n
2.\u6784\u9020\u51fd\u6570\u65b9\u6cd5\uff1a<\/h1>\n
#include<iostream>\r\nusing namespace std;\r\n\r\nclass add{\r\n\tpublic:\r\n\t\tadd(){\r\n\t\t\tn++;\r\n\t\t\tsum+=n;\r\n\t\t}\r\n\t\tstatic int n;\r\n\t\tstatic int sum;\r\n};\r\n\r\nint add::n=0;\r\nint add::sum=0;\r\n\r\nint main(){\r\n\tint nnnnn=100;\r\n\tadd *p = new add[nnnnn];\r\n\tcout<<add::sum<<endl;\r\n\tdelete[] p;\r\n\tp=NULL; \r\n\treturn 0;\r\n}<\/code><\/pre>\n
\u6784\u9020\u7684\u65b9\u6cd5\uff1a\u6ce8\u610f\u8bb0\u5f97\u9500\u6bc1\uff0c\u522b\u5f53\u91ce\u6307\u9488<\/p>\n
\u521b\u5efa\u4e24\u4e2a\u9759\u6001\u7684\u53d8\u91cfn\u548csum\u5728\u4e00\u4e2a\u7c7b\u91cc\u9762\uff0c\u8fd9\u4e2a\u4e24\u4e2a\u53c2\u6570\u8bbe\u7f6e\u9ed8\u8ba4\u503c\u4e3a0\uff0c\u7136\u540e\u521b\u5efannnnn\u4e2a\u5bf9\u8c61\uff08\u5c31\u662f\u9898\u76ee\u8981\u6c42\u7684\u4e0a\u754c\u503c\uff09\uff0c\u6bcf\u6b21\u4e00\u521b\u5efa\u5c31\u4f1a\u5bf9\u8fd9\u4e24\u4e2a\u9759\u6001\u7684\u6210\u5458\u53d8\u91cf\u8fdb\u884c\u4e00\u6b21\u9012\u589e\u7684\u64cd\u4f5c\u548c\u4e00\u4e2a\u6c42\u548c\u7684\u64cd\u4f5c\uff0c\u5f53\u6211\u4eec\u521b\u5efa\u4e86nnnnn\u4e2a\u5bf9\u8c61\u4e4b\u540e\uff0c\u6c42\u5f97\u5f97sum\u503c\u4e5f\u5c31\u662f\u6211\u4eec\u9898\u76ee\u5f97\u8981\u6c42\u503c\u3002<\/p>\n
3.\u6700\u7b80\u5355\u7684\u77ed\u8def\u65b9\u6cd5<\/h1>\n
#include<iostream>\r\nusing namespace std;\r\n\r\nint fun(int n){\r\n\tint ans=n;\r\n\tans && (ans+=fun(n-1));\r\n\treturn ans;\t\r\n}\r\n\r\nint main(){\r\n\tcout<<fun(100)<<endl;\r\n\treturn 0;\r\n}<\/code><\/pre>\n
\u8fd9\u4e2a\u662f\u6700\u7b80\u5355\u5f97\u505a\u6cd5\uff0c\u5229\u7528C\/C++\u8bed\u8a00\uff0c\u5224\u65ad\u8bed\u53e5\u7684\u77ed\u8def\u7279\u6027\uff0c\u4e5f\u5c31\u662f&&\u4e0e\u5224\u65ad\u4e2d\uff0c\u5de6\u8fb9\u4e00\u65e6\u4e3a\u5047\u503c\uff0c\u53f3\u8fb9\u4fbf\u4e0d\u518d\u8fdb\u884c\u8fd0\u7b97\uff08\u76f4\u63a5\u5ffd\u7565\uff09\uff0c\u5229\u7528\u8fd9\u4e2a\u65b9\u6cd5\u5de7\u5999\u7684\u66ff\u4ee3if\u7684\u4f7f\u7528\uff0c\u518d\u914d\u5408\u4e0a\u51fd\u6570\u9012\u5f52\u5373\u53ef\u5b8c\u6210\u3002<\/p>\n
\u53e6\u4e00\u4e2a\u77ed\u8def\u7684\u8868\u793a\u6cd5\uff0c\u5176\u5b9e\u6ca1\u4ec0\u4e48\u533a\u522b\uff0c\u5229\u7528!ans\u53d6\u53cd\u4e0e || \u6216\u5224\u65ad\uff0c\u5f53ans\u4e3a\u6b63\u6570\u7684\u65f6\u5019\u53ea\u8003\u8651\u6216\u7684\u540e\u534a\u6bb5\uff0c\u3010\u8df3\u8fc7\u3011\u524d\u534a\u6bb5\uff0c\u5f53ans\u4e3a0\u7684\u65f6\u5019\u5c31\u8df3\u8fc7\u540e\u534a\u6bb5\uff0c\u76f4\u63a5\u8f93\u51fa\u3002<\/p>\n
#include<iostream>\r\nusing namespace std;\r\n\r\nint fun(int n){\r\n\tint ans=n;\r\n\t!ans || (ans+=fun(n-1));\r\n\treturn ans;\t\r\n}\r\n\r\nint main(){\r\n\tcout<<fun(100)<<endl;\r\n\treturn 0;\r\n}\r\n<\/code><\/pre>\n
4.\u7b49\u5dee\u6570\u5217\u516c\u5f0f+\u4e8c\u8fdb\u5236\u5904\u7406<\/h1>\n
\u8fd9\u65b9\u6cd5\u6ca1\u6709\u4ec0\u4e48\u5b9e\u9645\u7684\u610f\u4e49\uff0c\u5728\u9ad8\u4e2d\u6570\u5b66\u6211\u4eec\u5b66\u4e60\u8fc7\uff0c\u7b49\u5dee\u6570\u5217\u7684\u548c\u7b49\u4e8e\uff08\uff08\u9996\u9879+\u672b\u9879\uff09*\u9879\u6570\uff09\/2\uff0c\u7684\u516c\u5f0f\uff0c\u7136\u800c\u9898\u76ee\u7981\u6b62\u4f7f\u7528\u6574\u9664\uff0c\u5bfc\u81f4\u4e0d\u80fd\u76f4\u63a5\u9664\u4ee52\uff0c\u4f46\u662f\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8ba1\u7b97\u673a\u7684\u539f\u7406\u89e3\u51b3<\/p>\n
\u8ba1\u7b97\u673a\u59cb\u7ec8\u4ee5\u4e8c\u8fdb\u5236\u8ba1\u7b97\uff0c\u5f53\u4e8c\u8fdb\u5236\u6570\u6574\u4f53\u53f3\u79fb\u4e00\u4f4d\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u6570\u636e\u6574\u4f53\u9664\u4ee52\uff0c\u4e8e\u662f\u5c31\u6784\u9020\u51fa\u4e86\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u3002<\/p>\n
#include<iostream>\r\nusing namespace std;\r\n\r\nint main(){\r\n\tint n=100;\r\n\tint ans = ((1+n)*n)>>1;\r\n\tcout<<ans<<endl;\r\n\treturn 0;\r\n}<\/code><\/pre>\n
\u548c\u670b\u53cb\u4e00\u8d77\u8ba8\u8bba\u7684\u9898\u76ee\u8bb0\u5f55\uff0c\u4f1a\u6301\u7eed\u66f4\u65b0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\uff1a\u6c421+2+\u2026\u2026+n\uff0c\u8981\u6c42\u4e0d\u80fd\u4f7f\u7528\u6574\u9664\u6cd5\uff0cfor\uff0cwhile\uff0cif\uff0celse\uff0cswitch\uff0cca […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,32,43],"tags":[33,6],"class_list":["post-618","post","type-post","status-publish","format-standard","hentry","category-c","category-cpp","category-programming-language","tag-c","tag-algorithm"],"views":1231,"_links":{"self":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/comments?post=618"}],"version-history":[{"count":5,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/618\/revisions"}],"predecessor-version":[{"id":623,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/618\/revisions\/623"}],"wp:attachment":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/media?parent=618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/categories?post=618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/tags?post=618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}