{"id":123,"date":"2020-07-25T00:00:36","date_gmt":"2020-07-24T16:00:36","guid":{"rendered":"http:\/\/121.89.208.222\/?p=123"},"modified":"2020-12-10T14:24:25","modified_gmt":"2020-12-10T06:24:25","slug":"%e6%b1%87%e7%bc%96%e5%ae%9e%e7%8e%b0%e5%87%af%e6%92%92%e5%8a%a0%e5%af%86%e5%92%8c%e8%a7%a3%e5%af%86","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/study\/compilation\/123.html","title":{"rendered":"\u6c47\u7f16\u5b9e\u73b0\u51ef\u6492\u52a0\u5bc6\u548c\u89e3\u5bc6"},"content":{"rendered":"\n

1.\u9898\u76ee\uff1a<\/strong>
\u8bbe\u8ba1\u4e00\u4e2a\u51ef\u6492\u5bc6\u7801\u52a0\u5bc6\u5668\uff0c\u8f93\u5165\u4e00\u4e32\u5b57\u7b26\u4e32\uff08\u957f\u5ea6\u4e0d\u8d85\u8fc720\uff09\u4ee5\u56de\u8f66\u7ed3\u675f\uff0c\u4e4b\u540e\u518d\u8f93\u5165\u4e00\u4e2a-8\u52308\u4e4b\u95f4\u7684\u6574\u6570X\u3002
\uff081\uff09\u5982\u679c\u8f93\u5165\u975e\u6570\u5b57\uff0c\u5219\u901a\u8fc7\u8f93\u51fa\u63d0\u793a\uff1b
\uff082\uff09\u5982X=0\uff0c\u5219\u8f93\u51fa\u8be5\u5b57\u7b26\u4e32\u672c\u8eab\uff1b
\uff083\uff09\u5982\u679c08\u6216\u8005X<-8\uff0c\u5219\u9000\u51fa\u5230DOS\u7cfb\u7edf\u3002<\/p>\n\n\n\n

2.\u5206\u6790<\/strong>
2.1\u51ef\u6492\u5bc6\u7801\u52a0\u5bc6\u89e3\u5bc6\u5668\u7684\u539f\u7406<\/strong>
\u51ef\u6492\u52a0\u5bc6\u6cd5\u7684\u66ff\u6362\u65b9\u6cd5\u662f\u901a\u8fc7\u6392\u5217\u660e\u6587\u548c\u5bc6\u6587\u5b57\u6bcd\u8868\uff0c\u5bc6\u6587\u5b57\u6bcd\u8868\u793a\u901a\u8fc7\u5c06\u660e\u6587\u5b57\u6bcd\u8868\u5411\u5de6\u6216\u5411\u53f3\u79fb\u52a8\u4e00\u4e2a\u56fa\u5b9a\u6570\u76ee\u7684\u4f4d\u7f6e\u3002\u4f8b\u5982\uff0c\u5f53\u504f\u79fb\u91cf\u662f\u5de6\u79fb3\u7684\u65f6\u5019\uff08\u89e3\u5bc6\u65f6\u7684\u5bc6\u94a5\u5c31\u662f3\uff09\uff1a
\u660e\u6587\u5b57\u6bcd\u8868\uff1aABCDEFGHIJKLMNOPQRSTUVWXYZ
\u5bc6\u6587\u5b57\u6bcd\u8868\uff1aDEFGHIJKLMNOPQRSTUVWXYZABC
\u4f7f\u7528\u65f6\uff0c\u52a0\u5bc6\u8005\u67e5\u627e\u660e\u6587\u5b57\u6bcd\u8868\u4e2d\u9700\u8981\u52a0\u5bc6\u7684\u6d88\u606f\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u6bcd\u6240\u5728\u4f4d\u7f6e\uff0c\u5e76\u4e14\u5199\u4e0b\u5bc6\u6587\u5b57\u6bcd\u8868\u4e2d\u5bf9\u5e94\u7684\u5b57\u6bcd\u3002\u9700\u8981\u89e3\u5bc6\u7684\u4eba\u5219\u6839\u636e\u4e8b\u5148\u5df2\u77e5\u7684\u5bc6\u94a5\u53cd\u8fc7\u6765\u64cd\u4f5c\uff0c\u5f97\u5230\u539f\u6765\u7684\u660e\u6587\u3002\u4f8b\u5982\uff1a
\u660e\u6587\uff1aTHE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
\u5bc6\u6587\uff1aWKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ
\u51ef\u6492\u52a0\u5bc6\u6cd5\u7684\u52a0\u5bc6\u3001\u89e3\u5bc6\u65b9\u6cd5\u8fd8\u80fd\u591f\u901a\u8fc7\u540c\u4f59\u7684\u6570\u5b66\u65b9\u6cd5\u8fdb\u884c\u8ba1\u7b97\u3002\u9996\u5148\u5c06\u5b57\u6bcd\u7528\u6570\u5b57\u4ee3\u66ff\uff0cA=0\uff0cB=1\uff0c\u2026\uff0cZ=25\u3002\u6b64\u65f6\u504f\u79fb\u91cf\u4e3an\u7684\u52a0\u5bc6\u65b9\u6cd5\u5373\u4e3a\uff1a
En(x)=(x+n)mod26
\u89e3\u5bc6\u5c31\u662f\uff1a\u3000\u3000Dn(x)=(x\u2212n)mod 26
2.2\u9898\u76ee\u5206\u6790<\/strong>
\u6839\u636e\u9898\u76ee\u53ef\u77e5\uff0c\u9700\u8981\u8bbe\u8ba1\u4e00\u4e2a\u6c47\u7f16\u7a0b\u5e8f\u6ee1\u8db3\u9898\u76ee\u7ed9\u7684\u6761\u4ef6\uff0c\u5176\u6838\u5fc3\u96be\u70b9\u662f\u5728\u4e8e\u5b9e\u73b0\u51ef\u6492\u52a0\u5bc6\u548c\u89e3\u5bc6\u7684\u8fc7\u7a0b\u3002
\uff081\uff09\u5f53\u8f93\u5165\u7684\u6570\u5b57\u4e3a-8<= X < 0\u65f6\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u89e3\u5bc6\u64cd\u4f5c\uff0c\u8fd9\u4e2a\u8f93\u5165\u7684\u6570\u5b57\u5c31\u662f\u89e3\u5bc6\u65f6\u7684\u504f\u79fb\u91cf\uff0c\u6bd4\u5982\uff1a
\u5f53\u6211\u4eec\u8f93\u5165\u5b57\u7b26\u4e32 \uff1aabcdA
\u8f93\u5165\u6570\u5b57\uff1a -1
\u5219\u89e3\u5bc6\u540e\u7684\u7ed3\u679c\u662f\uff1azabZ
\uff082\uff09\u5f53\u6211\u4eec\u8f93\u5165\u7684\u6570\u5b57\u4e3a X = 0\u65f6\u76f4\u63a5\u663e\u793a\u51fa\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u5373\u53ef\u3002
\uff083\uff09\u5f53\u6211\u4eec\u8f93\u5165\u7684\u6570\u5b57\u4e3a 0< X <=8\u65f6\uff0c\u9700\u8981\u8fdb\u884c\u51ef\u6492\u52a0\u5bc6\uff0c\u8fd9\u4e2a\u8f93\u7684\u6570\u5b57X\u5c31\u662f\u52a0\u5bc6\u65f6\u7684\u504f\u79fb\u91cf\uff0c\u6bd4\u5982\uff1a
\u5f53\u6211\u4eec\u8f93\u5165\u5b57\u7b26\u4e32 \uff1aabcdA
\u8f93\u5165\u6570\u5b57\uff1a 1
\u5219\u89e3\u5bc6\u540e\u7684\u7ed3\u679c\u662f\uff1abcdB
\uff084\uff09\u5728\u672c\u6b21\u7a0b\u5e8f\u4e2d\uff0c\u82e5\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u4e2d\u542b\u6709\u4e0d\u662f\u5b57\u6bcd\u7684\u5b57\u7b26\u5219\u8be5\u5b57\u7b26\u4e0d\u8fdb\u884c\u5904\u7406\uff0c\u6bd4\u5982\uff1a\u5b57\u7b26\u4e32\u201cabcd123\u201d\uff0c\u5047\u8bbe\u52a0\u5bc6\u504f\u79fb\u91cfX=1\uff0c\u5219\u8fdb\u884c\u52a0\u5bc6\u540e\u53d8\u4e3a\uff1a\u201cbcde123\u201d\uff0c\u89e3\u5bc6\u4e5f\u662f\u5982\u6b64\u3002
3.\u8f6f\u4ef6\u8bbe\u8ba1<\/strong>
3.1\u8be5\u7a0b\u5e8f\u7684\u7b97\u6cd5\u6b65\u9aa4<\/strong>
1.\u8f93\u5165\u5b57\u7b26\u4e32codeStr\uff1b
2.\u8f93\u5165\u51ef\u6492\u52a0\u5bc6\u6216\u89e3\u5bc6\u7684\u504f\u79fb\u91cfX\uff1b
2.1\u5982\u679cX<-8\u6216\u8005 X < 8\uff0c\u76f4\u63a5\u7ed3\u675f\u7a0b\u5e8f\u8fd4\u56dedos\u7cfb\u7edf\uff1b
2.2\u5426\u5219\u7ee7\u7eed\u7b2c3\u6b65\uff1b
3.\u5224\u65adX>=0\u662f\u5426\u6210\u7acb
3.1\u5982\u679c\u4e0d\u6210\u7acb\uff0c\u5219\u8fdb\u884c\u89e3\u5bc6\u64cd\u4f5c\uff0c\u5e76\u8f93\u51fa\u89e3\u5bc6\u540e\u5b57\u7b26\u4e32\uff1b
3.2\u5982\u679c\u6210\u7acb,\u5219\u7ee7\u7eed\u7b2c4\u6b65\uff1b
4.\u5224\u65adX > 0\u662f\u5426\u6210\u7acb
4.1\u5982\u679c\u6210\u7acb\uff0c\u5219\u8fdb\u884c\u52a0\u5bc6\u64cd\u4f5c\uff0c\u5e76\u8f93\u51fa\u52a0\u5bc6\u540e\u5b57\u7b26\u4e32;
4.2\u5982\u679c\u4e0d\u6210\u7acb\uff0c\u5219\u76f4\u63a5\u8f93\u51fa\u5b57\u7b26\u4e32codeStr;
5.\u7ed3\u675f\u7a0b\u5e8f\u8fd4\u56dedos\u754c\u9762\u3002
3.2\u8be5\u7a0b\u5e8f\u7684\u7a0b\u5e8f\u6846\u56fe<\/strong><\/p>\n\n\n\n

\"\"\/<\/figure >\n