{"id":183,"date":"2019-09-27T20:58:37","date_gmt":"2019-09-27T12:58:37","guid":{"rendered":"https:\/\/www.overwatchss.club\/?p=183"},"modified":"2019-09-27T21:02:49","modified_gmt":"2019-09-27T13:02:49","slug":"%e7%ac%ac%e4%ba%8c%e7%ab%a0-%e7%ae%97%e6%b3%95%e5%88%86%e6%9e%90%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/www.overwatchss.club\/?p=183","title":{"rendered":"\u7b2c\u4e8c\u7ae0&#8211;\u7b97\u6cd5\u5206\u6790\u57fa\u7840"},"content":{"rendered":"\n<p>2.1 \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790<\/p>\n\n\n\n<p>    \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790\u662f\u4e00\u79cd\u4e8b\u524d\u5206\u6790\u4f30\u7b97\u7684\u65b9\u6cd5\uff0c\u4ed6\u662f\u5bf9\u7b97\u6cd5\u6d88\u8017\u7684\u8d44\u6e90\u7684\u4e00\u79cd\u6e10\u8fdb\u6027\u5206\u6790\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>   \u6e10\u8fdb\u6027\u5206\u6790\uff1a\u53ea\u5173\u6ce8\u8f93\u5165\u89c4\u6a21\u589e\u5927\u65f6\u7b97\u6cd5\u8fd0\u884c\u65f6\u95f4\u7684\u589e\u957f\u8d8b\u52bf\u3002<\/p>\n\n\n\n<p>2.2 \u8f93\u5165\u89c4\u6a21\u4e0e\u57fa\u672c\u8bed\u53e5<\/p>\n\n\n\n<p>   \u8f93\u5165\u89c4\u6a21\uff1a\u6307\u8f93\u5165\u91cf\u7684\u591a\u5c11\u3002<\/p>\n\n\n\n<p>   \u57fa\u672c\u8bed\u53e5\uff1a\u6267\u884c\u6b21\u6570\u4e0e\u6574\u4e2a\u7b97\u6cd5\u6267\u884c\u6b21\u6570\u6210\u6b63\u6bd4\u7684\u8bed\u53e5\uff0c\u57fa\u672c\u8bed\u53e5\u5bf9\u7b97\u6cd5\u8fd0\u884c\u65f6\u95f4\u7684\u8d21\u732e\u6700\u5927\uff0c\u662f\u7b97\u6cd5\u4e2d\u6700\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u4f8b\u5982\u4e0b\u884c\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int SeqSearch(int A[],int n,int k)\n{\n    for(int i=0;i&lt;n;i++)\n       if(A[i] == k)  break;   \/\/\u57fa\u672c\u8bed\u53e5\u662f\u8fd9\u4e2a\u6bd4\u8f83\u64cd\u4f5cA[i] == k\n    if(i == n)  return 0;\n    else  return (i+1);\n}\n\/\/\u8f93\u5165\u89c4\u6a21\u662f\u5e26\u70b8\u627e\u7684\u8bb0\u5f55\u4e2a\u6570n\n\/\/\u66f4\u591a\u4f8b\u5b50\uff0c\u67e5\u627e\u8bfe\u672cP18\u9875\u5185\u5bb9<\/code><\/pre>\n\n\n\n<p>2.3\u7b97\u6cd5\u7684\u6e10\u8fdb\u5206\u6790<\/p>\n\n\n\n<p>  \u5b9a\u4e49\uff1a\u82e5\u5b58\u5728\u4e24\u4e2a\u6b63\u7684\u5e38\u719fc\u548cn\u3002\u5bf9\u4e8e\u4efb\u610f\u7684n &gt;= N,\u90fd\u6709T(n) &lt;= c*f(n);\u5219\u79f0T(n) = O(f(n)) &lt;\u6216\u8005\u79f0\u7b97\u6cd5\u5728 O(f(n))\u4e2d&gt; \u3002<\/p>\n\n\n\n<p>  \u6e10\u8fdb\u5206\u6790\u8981\u5206\u6790\u6700\u574f\uff0c\u6700\u597d\uff0c\u5e73\u5747\u60c5\u51b5\u3002<\/p>\n\n\n\n<p class=\"has-text-color has-vivid-red-color\">  \u2605\u975e\u9012\u5f52\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790\uff1a\u786e\u5b9a\u95ee\u9898\u7684\u8f93\u5165\u89c4\u6a21\uff0c\u627e\u51fa\u7b97\u6cd5\u7684\u57fa\u672c\u8bed\u53e5\uff0c\u68c0\u67e5\u57fa\u672c\u8bed\u53e5\u7684\u6267\u884c\u6b21\u6570\u662f\u5426\u53ea\u4f9d\u8d56\u8f93\u5165\u89c4\u6a21\uff0c\u5efa\u7acb\u57fa\u672c\u8bed\u53e5\u6267\u884c\u6b21\u6570\u7684\u6c42\u548c\u8868\u8fbe\u5f0f\uff0c\u7528\u6e10\u8fdb\u7b26\u53f7\u8868\u793a\u8fd9\u4e2a\u6c42\u548c\u8868\u8fbe\u5f0f\uff08\u7528\u5927O\u8868\u793a\uff09\u3002<\/p>\n\n\n\n<p class=\"has-text-color has-luminous-vivid-orange-color\">  \u2605\u9012\u5f52\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790\uff1a\u9012\u5f52\u5c31\u662f\u5c06\u5730\u63a8\u5173\u7cfb\u4e2d\u7b49\u5f0f\u7684\u53f3\u8fb9\u7684\u9879\u6839\u636e\u9012\u63a8\u5f0f\u8fdb\u884c\u66ff\u6362\u3002\u4e3e\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>                       { 7            n = 1\n               T(n) =  { \n                       { 2T(n\/2) + 5n^2     n > 1<\/code><\/pre>\n\n\n\n<p>  \u89e3\uff1aT(n) = 2T(n\/2) + 5n^2 = 2(2T((n\/2)\/2 + 5(n\/2)^2 +5n^2 = 2(2(2T(n\/8) + 5(n\/4)^2) + 5(n\/2)^2) + 5n^2      .... = 2^k*T(1) + 2^(k-1)*5(n\/(2^(k-1)) + ... + 2*5(n\/2)^2 + 5n^2<\/p>\n\n\n\n<p>         \u6700\u7ec8\u8868\u8fbe\u4e3a\uff1aT(n) = 7n + 5n^2(2-1\/2^(k-1)) = 10n^2-3n &lt;= 10n^2 = O(n^2)<\/p>\n\n\n\n<p>2.4 \u7b97\u6cd5\u7684\u7a7a\u95f4\u5206\u6790<\/p>\n\n\n\n<p class=\"has-text-color has-vivid-cyan-blue-color\">   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\u5224\u5b9a\u6811\u6a21\u578b\uff1a\u6ee1\u8db3\u4e24\u4e2a\u6761\u4ef6\u7684\u4e8c\u53c9\u6811\uff0c\u4e00\u662f\u6bcf\u4e00\u4e2a\u5185\u90e8\u7ed3\u70b9\u5bf9\u5e94\u4e00\u4e2a\u5f62\u5982x&lt;=y\u7684\u6bd4\u8f83\uff0c\u5982\u679c\u5173\u7cfb\u6210\u7acb\uff0c\u5219\u63a7\u5236\u8f6c\u79fb\u5230\u8be5\u7ed3\u70b9\u7684\u5de6\u5b50\u6811\uff0c\u5426\u5219\uff0c\u63a7\u5236\u8f6c\u79fb\u5230\u8be5\u7ed3\u70b9\u7684\u53f3\u5b50\u6811\uff1b\u4e8c\u662f\u6bcf\u4e00\u4e2a\u53f6\u5b50\u7ed3\u70b9\u8868\u793a\u95ee\u9898\u7684\u4e00\u4e2a\u7ed3\u679c\uff0c\u5728\u7528\u5224\u5b9a\u4e66\u6a21\u578b\u5efa\u7acb\u95ee\u9898\u7684\u65f6\u95f4\u4e0b\u754c\u65f6\uff0c\u901a\u5e38\u5ffd\u7565\u6c42\u89e3\u95ee\u9898\u7684\u6240\u6709\u7b97\u6570\u8fd0\u7b97\uff0c\u53ea\u8003\u8651\u6267\u884c\u5206\u652f\u7684\u8f6c\u79fb\u6b21\u6570\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" style=\"text-align:center\">\u4f8b\u9898<\/h4>\n\n\n\n<p style=\"text-align:center\"><strong>\u4e0b\u5217\u7b97\u6cd5\u7684\u57fa\u672c\u8bed\u53e5\uff0c\u6267\u884c\u4e86\u591a\u5c11\u6b21\uff0c\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\uff1f<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int\u2002Stery(int\u2002n)\u2002\n{\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\n    int\u2002S\u2002=\u20020;\u2002\u2002\u2002\n    for\u2002(int\u2002i\u2002=\u20021;\u2002i\u2002&lt;=\u2002n;\u2002i++)\u2002\u2002\u2002\u2002\u2002\n        S\u2002=\u2002S\u2002+\u2002i\u2002*\u2002i;\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\n    return\u2002S;\n\u2002}<\/code><\/pre>\n\n\n\n<p>\u57fa\u672c\u8bed\u53e5: s=s+i*i;   \u6267\u884c\u4e86n\u6b21;  \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027O(n)\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int\u2002Q(int\u2002n)\u2002\u2002\u2002\n{\u2002\u2002\u2002\u2002\u2002\u2002\u2002\u2002\n    if\u2002(n\u2002==\u20021)\u2002\u2002\n      return\u20021;\u2002\u2002\u2002\u2002\n    else\u2002\u2002\n      return\u2002Q(n-1)\u2002+\u20022\u2002*\u2002n\u2002-\u20021;\n\u2002}<\/code><\/pre>\n\n\n\n<p> \u57fa\u672c\u8bed\u53e5: Q(n-1)+2*n-1;   \u6267\u884c\u4e86n\u6b21;  \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027O(n)\u3002 <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>for\u2002(i\u2002=\u20021;\u2002i\u2002&lt;=\u2002n;\u2002i++)\n   \u2002if\u2002(2*i\u2002&lt;=\u2002n)\u2002\u2002\n      for\u2002(j\u2002=\u20022*i;\u2002j\u2002&lt;=\u2002n;\u2002j++)\u2002\u2002\n\u2002       y\u2002=\u2002y\u2002+\u2002i\u2002*\u2002j;<\/code><\/pre>\n\n\n\n<p> \u57fa\u672c\u8bed\u53e5: 2*i &lt;=n\u548cy=y+i*i;   \u90fd\u6267\u884c\u4e86n\/2\u6b21;  \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027O(n)\u3002 <\/p>\n\n\n\n<p class=\"has-text-color has-luminous-vivid-orange-color\">\u57fa\u672c\u8bed\u53e5\u627e\u6267\u884c\u6b21\u6570\u4e0e\u6574\u4e2a\u7b97\u6cd5\u6267\u884c\u6b21\u6570\u6210\u6b63\u6bd4\u7684\uff0c\u7b97\u6cd5\u590d\u6742\u5ea6\uff1a\u5e26N\u5c31\u662fO(n),N^2\u5c31\u662fO(n^2).\u627eN\u7684\u6700\u9ad8\u6b21\u3002 <\/p>\n\n\n\n<p style=\"text-align:center\">   <strong>\u4f7f\u7528\u6269\u5c55\u9012\u5f52\u6280\u672f\u6c42\u89e3\u4e0b\u5217\u9012\u63a8\u516c\u5f0f<\/strong><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"201\" height=\"55\" src=\"https:\/\/www.overwatchss.club\/wp-content\/uploads\/2019\/09\/\u6700\u4f18\u5316-\u7b2c\u4e00\u7ae0-\u4f8b\u98984.png\" alt=\"\" class=\"wp-image-188\"\/><\/figure><\/div>\n\n\n\n<pre class=\"wp-block-code\"><code>int\u2002T(int\u2002n){\n    if(n==1)\u2002\n      return\u20024;\u2002\n    else\u2002if(n>1)\u2002\n      return\u20023*T(n-1);\u2002\n }<\/code><\/pre>\n\n\n\n<p class=\"has-text-color has-luminous-vivid-amber-color\">\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u4e24\u4e2aif\u533a\u5206\u5f00n\u7684\u5b9a\u4e49\u57df\uff0c\u7136\u540e\u5206\u522b\u8fd4\u56de\u5bf9\u5e94\u7684\u8ba1\u7b97\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>2.1 \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790 \u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u6027\u5206\u6790\u662f\u4e00\u79cd\u4e8b\u524d\u5206\u6790\u4f30\u7b97\u7684\u65b9\u6cd5\uff0c\u4ed6\u662f\u5bf9\u7b97\u6cd5\u6d88\u8017\u7684\u8d44\u6e90\u7684\u4e00\u79cd\u6e10\u8fdb\u6027\u5206\u6790\u65b9\u6cd5\u3002 \u6e10\u8fdb\u6027\u5206\u6790 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