{"id":324,"date":"2025-04-08T00:49:55","date_gmt":"2025-04-07T16:49:55","guid":{"rendered":"https:\/\/m.qzcy2.top\/?p=324"},"modified":"2025-04-08T00:51:14","modified_gmt":"2025-04-07T16:51:14","slug":"%e7%ac%ac28%e5%9c%ba%e8%93%9d%e6%a1%a5%e5%85%a5%e9%97%a8%e8%b5%9b","status":"publish","type":"post","link":"https:\/\/m.qzcy2.top\/index.php\/2025\/04\/08\/%e7%ac%ac28%e5%9c%ba%e8%93%9d%e6%a1%a5%e5%85%a5%e9%97%a8%e8%b5%9b\/","title":{"rendered":"\u7b2c28\u573a\u84dd\u6865\u5165\u95e8\u8d5b"},"content":{"rendered":"<h1>\u8bf4\u660e<\/h1>\n<p>\u6b64\u6587\u4ec5\u4e3a\u4f5c\u8005\u7684\u4e2a\u4eba\u89c1\u89e3\uff0c\u539f\u9898\u94fe\u63a5\uff1a<a href=\"https:\/\/www.lanqiao.cn\/oj-contest\/newbie-28\/\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/www.lanqiao.cn\/oj-contest\/newbie-28\/<\/a><\/p>\n<h2>\u603b\u7ed3<\/h2>\n<ul>\n<li><span style=\"color: #003366;\">\u8fd9\u662f\u84dd\u6865\u676f\u7701\u8d5b\u524d\u84dd\u6865\u5b98\u65b9\u7684\u6700\u540e\u4e00\u6b21\u6bd4\u8d5b\u6240\u4ee5\u5f88\u7b80\u5355\uff0c\u57fa\u672c\u90fd\u662f\u4e00\u4e9b\u8bed\u6cd5\u95ee\u9898\u3002\u5176\u4e2d1--2\u9898\u592a\u8fc7\u8bed\u6cd5\uff0c\u6240\u4ee5\u5c31\u4e0d\u5c55\u793a\u4e86\u3002\u8981\u591a\u719f\u7ec3cpp\u79cdSTL\u7684\u8fd0\u7528\u3002<\/span><\/li>\n<\/ul>\n<h1>3.\u84dd\u6865\u901f\u7b97<\/h1>\n<h2>\u9898\u76ee\u63cf\u8ff0<\/h2>\n<ul>\n<li>\u84dd\u6865\u676f\u5927\u8d5b\u6700\u8fd1\u65b0\u589e\u4e86\u4e00\u9879\u5a31\u4e50\u6bd4\u8d5b\u2014\u2014\u53e3\u7b97\u5927\u8d5b\uff0c\u76ee\u7684\u662f\u6d4b\u8bd5\u9009\u624b\u7684\u53e3\u7b97\u80fd\u529b\u3002\u6bd4\u8d5b\u89c4\u5219\u5982\u4e0b\uff1a\u521d\u59cb\u7ed9\u5b9a\u4e00\u4e2a\u957f\u5ea6\u4e3a N \u7684\u6570\u7ec4 A\uff0c\u5176\u4e2d\u7b2c i \u4e2a\u6570\u5b57\u4e3a A\u1d62\u3002\u968f\u540e\u6570\u7ec4\u4f1a\u88ab\u9690\u85cf\uff0c\u5e76\u8fdb\u884c Q \u6b21\u503c\u57df\u53d8\u6362\u64cd\u4f5c\u3002\n<p>\u6bcf\u6b21\u64cd\u4f5c\u7ed9\u51fa\u4e24\u4e2a\u6570\u5b57 L,R (1 \u2264 L \u2264 R \u2264 N)\uff0c\u8868\u793a\u5bf9\u5b50\u6570\u7ec4 [L,R] \u8fdb\u884c\u5982\u4e0b\u53d8\u6362\uff1a<\/p>\n<p>A[L] \u589e\u52a0 L<\/p>\n<p>A[L+1] \u51cf\u5c11 (L+1)<\/p>\n<p>A[L+2] \u589e\u52a0 (L+2)<\/p>\n<p>A[L+3] \u51cf\u5c11 (L+3)<\/p>\n<p>\u4ee5\u6b64\u7c7b\u63a8\uff0c\u76f4\u5230 R<\/p>\n<p>\u5728\u6240\u6709\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u9009\u624b\u9700\u8981\u5feb\u901f\u8ba1\u7b97\u51fa\u6700\u7ec8\u7684\u6570\u7ec4\u4e4b\u548c\uff0c\u6700\u5feb\u56de\u7b54\u51fa\u6b63\u786e\u7b54\u6848\u7684\u9009\u624b\u5c06\u4f1a\u83b7\u5f97\u5956\u52b1\u3002<\/li>\n<li>\u8f93\u5165\uff1a<br \/>\n\u7b2c\u4e00\u884c\u8f93\u5165\u4e24\u4e2a\u6574\u6570 N,Q (1 \u2264 N,Q \u2264 10\u2075) \u8868\u793a\u6570\u7ec4\u957f\u5ea6\u548c\u503c\u57df\u53d8\u6362\u64cd\u4f5c\u6b21\u6570\u3002\u7b2c\u4e8c\u884c\u8f93\u5165 N \u4e2a\u6574\u6570 A\u2081,A\u2082,A\u2083,\u22ef,A_N (1 \u2264 A\u1d62 \u2264 10\u2075) \u8868\u793a\u6570\u7ec4\u7684\u521d\u59cb\u503c\u3002\u63a5\u4e0b\u6765 Q \u884c\uff0c\u6bcf\u884c\u4e24\u4e2a\u6574\u6570 L,R (1 \u2264 L \u2264 R \u2264 N) \u8868\u793a\u4e00\u6b21\u503c\u57df\u53d8\u6362\u64cd\u4f5c\u3002<\/li>\n<li>\u8f93\u51fa\uff1a<br \/>\n\u8f93\u51fa\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u503c\u57df\u53d8\u6362\u64cd\u4f5c\u5b8c\u6bd5\u540e\u6570\u7ec4\u4e4b\u548c\u3002<\/li>\n<\/ul>\n<h2>\u793a\u4f8b<\/h2>\n<ul>\n<li>\u8f93\u5165\uff1a<br \/>\n5 2<br \/>\n1 2 3 4 5<br \/>\n1 3<br \/>\n4 5<\/li>\n<li>\u8f93\u51fa\uff1a<br \/>\n16<\/li>\n<\/ul>\n<h2>\u601d\u8def<\/h2>\n<ul>\n<li><span style=\"color: #008000;\">\u524d\u7f00\u548c\u3002\u89c2\u5bdf\u89c4\u5f8b\uff1ai\u4e3a\u5947\u6570\u65f6\uff0c\u6709L\u5bcc\u4f59\u3002\u76f8\u53cdi\u4e3a\u5076\u6570\u7684\u65f6\u5019L\u4f1a\u5168\u90e8\u62b5\u6d88\u6389\u3002\u5176\u4f59\u7684\u6570\u5b57\u6309\u7167\u6446\u52a8\u6570\u5217\u6c42\u548c\u89c4\u5f8b\u6c42\u548c\u5373\u53ef\u3002<span style=\"color: #0000ff;\">\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n).<\/span><\/span><\/li>\n<\/ul>\n<h2>\u4ee3\u7801<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">void solve()\r\n{\r\n    int n , q;\r\n    cin &gt;&gt; n &gt;&gt; q;\r\n    vector&lt;int&gt; a(n + 1);\r\n    int ans = 0;\r\n    for (int i = 1 ; i &lt;= n ; i ++ ) cin &gt;&gt; a[i] , ans += a[i];\r\n\r\n    while (q -- )\r\n    {\r\n        int l , r;\r\n        cin &gt;&gt; l &gt;&gt; r;\r\n        int num = r - l + 1;\r\n        if (num &amp; 1) ans += l + num \/ 2;\r\n        else ans -= num \/ 2;\r\n    }\r\n\r\n    cout &lt;&lt; ans &lt;&lt; endl;\r\n}<\/pre>\n<h1>4.\u6d53\u7f29\u5496\u5561\u6db2<\/h1>\n<h2>\u9898\u76ee\u63cf\u8ff0<\/h2>\n<ul>\n<li>\u84dd\u6865\u676f\u5907\u8d5b\u9009\u624b\u5c0f\u84dd\u6700\u8fd1\u5237\u9898\u5237\u5230\u72af\u56f0\uff0c\u51b3\u5b9a\u9760\u5496\u5561\u7eed\u547d\u3002\u4ed6\u624b\u4e0a\u6709 N \u79cd\u6d53\u7f29\u5496\u5561\u6db2\uff0c\u6d53\u5ea6\u5206\u522b\u662f A\u2081%, A\u2082%, ..., A_N%\uff0c\u6bcf\u79cd\u5b58\u8d27\u90fd\u662f\u65e0\u9650\u7684\u3002\u4e3a\u4e86\u63d0\u795e\u53c8\u4e0d\u70b8\u8111\uff0c\u5c0f\u84dd\u9700\u8981\u6309\u6bd4\u4f8b\u6df7\u5408\u8fd9\u4e9b\u6d53\u7f29\u5496\u5561\u6db2\uff0c\u8c03\u51fa\u4e00\u676f\u6d53\u5ea6\u4e3a M% \u7684\u5496\u5561\u3002<\/li>\n<li>\u8f93\u5165\u683c\u5f0f\uff1a<br \/>\n\u7b2c\u4e00\u884c\u5305\u542b\u4e00\u4e2a\u6574\u6570 T\uff081 \u2264 T \u2264 10\u00b3\uff09\uff0c\u8868\u793a\u6d4b\u8bd5\u6570\u636e\u7684\u7ec4\u6570\u3002\u63a5\u4e0b\u6765\u7684\u6bcf\u7ec4\u6570\u636e\u5305\u542b\u4e24\u884c\uff1a\u7b2c\u4e00\u884c\u5305\u542b\u4e24\u4e2a\u6574\u6570 N \u548c M\uff081 \u2264 N,M \u2264 100\uff09\uff0c\u5206\u522b\u8868\u793a\u6d53\u7f29\u5496\u5561\u6db2\u7684\u79cd\u7c7b\u6570\u548c\u76ee\u6807\u6d53\u5ea6<\/p>\n<p>\u7b2c\u4e8c\u884c\u5305\u542b N \u4e2a\u6574\u6570 A\u2081,A\u2082,...,A_N\uff081 \u2264 A_i \u2264 100\uff09\uff0c\u8868\u793a\u6bcf\u79cd\u6d53\u7f29\u5496\u5561\u6db2\u7684\u6d53\u5ea6<\/li>\n<li>\u8f93\u51fa\u683c\u5f0f\uff1a<br \/>\n\u5bf9\u4e8e\u6bcf\u7ec4\u6d4b\u8bd5\u6570\u636e\uff0c\u8f93\u51fa\u4e00\u884c\uff1a\u5982\u679c\u53ef\u4ee5\u8c03\u51fa\u6d53\u5ea6\u4e3a M% \u7684\u5496\u5561\uff0c\u8f93\u51fa YES\u5426\u5219\u8f93\u51fa NO<\/li>\n<\/ul>\n<h2>\u793a\u4f8b<\/h2>\n<ul>\n<li>\u8f93\u5165\uff1a<br \/>\n2<br \/>\n1 90<br \/>\n20<br \/>\n2 60<br \/>\n50 70<\/li>\n<li>\u8f93\u51fa\uff1a<br \/>\nNO<br \/>\nYES<\/li>\n<li>\u8bf4\u660e\uff1a<br \/>\n\u7b2c\u4e00\u7ec4\u6d4b\u8bd5\u6570\u636e\uff1a\u53ea\u6709\u4e00\u79cd\u6d53\u5ea6\u4e3a20%\u7684\u5496\u5561\u6db2\u65e0\u6cd5\u8c03\u51fa90%\u7684\u5496\u5561\uff08\u53ea\u80fd\u5f97\u523020%\uff09<\/p>\n<p>\u8f93\u51faNO<\/p>\n<p>\u7b2c\u4e8c\u7ec4\u6d4b\u8bd5\u6570\u636e\uff1a<\/p>\n<p>\u6709\u4e24\u79cd\u6d53\u5ea6\uff1a50%\u548c70%<\/p>\n<p>\u53ef\u4ee5\u63091:1\u6bd4\u4f8b\u6df7\u5408\u5f97\u523060%\u7684\u5496\u5561<\/p>\n<p>\u8f93\u51faYES<\/li>\n<\/ul>\n<h2>\u601d\u8def<\/h2>\n<ul>\n<li><span style=\"color: #008000;\">\u601d\u7ef4\u9898\u3002\u53ef\u8c03\u5236\u7684\u6d53\u5ea6\u8303\u56f4\u4e00\u5b9a\u662f\u5927\u4e8e\u7b49\u4e8e\u5df2\u6709\u7684\u6700\u5c0f\u7684\u6d53\u5ea6\u800c\u5c0f\u4e8e\u7b49\u4e8e\u5df2\u6709\u7684\u6700\u5927\u7684\u6d53\u5ea6\u3002\u627e\u5230\u6700\u5927\u6700\u5c0f\u6bd4\u8f83\u4e4b\u540e\u7b26\u5408\u6761\u4ef6\u5373\u53ef\u3002<span style=\"color: #0000ff;\">\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n).<\/span><\/span><\/li>\n<\/ul>\n<h2>\u4ee3\u7801<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">void solve()\r\n{\r\n    int n , m;\r\n    cin &gt;&gt; n &gt;&gt; m;\r\n\r\n    int temp1 = -1 , temp2 = 0x3f3f3f3f;\r\n    for (int i = 1 ; i &lt;= n ; i ++ ) \r\n    {\r\n        int temp;\r\n        cin &gt;&gt; temp;\r\n        temp1 = max(temp1 , temp);\r\n        temp2 = min(temp2 , temp);\r\n    }\r\n\r\n    if (m &lt; temp2 || m &gt; temp1) cout &lt;&lt; \"NO\" &lt;&lt; endl;\r\n    else cout &lt;&lt; \"YES\" &lt;&lt; endl;\r\n\r\n}<\/pre>\n<h1>5.\u7834\u8bd1\u5bc6\u7801<\/h1>\n<h2>\u9898\u76ee\u63cf\u8ff0<\/h2>\n<ul>\n<li>\u5728\u8fd1\u671f\u4e3e\u529e\u7684\u84dd\u6865\u676f\u7ade\u8d5b\u4e2d\uff0c\u8bde\u751f\u4e86\u4e00\u573a\u6fc0\u52a8\u4eba\u5fc3\u7684\u53cc\u4eba\u7834\u8bd1\u6311\u6218\u3002\u6bd4\u8d5b\u7684\u4e3b\u529e\u65b9\u51c6\u5907\u4e86 N \u5757\u795e\u79d8\u7684\u5bc6\u7801\u82af\u7247\uff0c\u53c2\u8d5b\u961f\u4f0d\u9700\u8981\u5728\u8fd9\u573a\u667a\u529b\u7ade\u8d5b\u4e2d\u5c55\u793a\u56e2\u961f\u5408\u4f5c\u7684\u9ed8\u5951\u4e0e\u6548\u7387\u3002\u6bcf\u4e2a\u961f\u4f0d\u9700\u9009\u51fa\u4e00\u4f4d\u7834\u8bd1\u8005\u4e0e\u4e00\u4f4d\u4f20\u8f93\u8005\uff1a\u7834\u8bd1\u8005\u7684\u4efb\u52a1\u662f\u89e3\u9501\u82af\u7247\u4e2d\u9690\u85cf\u7684\u5bc6\u7801\n<p>\u4f20\u8f93\u8005\u5219\u8d1f\u8d23\u5c06\u89e3\u5bc6\u540e\u7684\u5bc6\u7801\u51c6\u786e\u65e0\u8bef\u5730\u53d1\u9001\u81f3\u4e3b\u529e\u65b9\u7684\u7535\u8111<\/p>\n<p>\u5c0f\u84dd\u4e0e\u5c0f\u6865\u7ec4\u961f\u53c2\u8d5b\uff1a<\/p>\n<p>\u5c0f\u84dd\u88ab\u4efb\u547d\u4e3a\u7834\u8bd1\u8005\uff0c\u4e13\u6ce8\u4e8e\u89e3\u5bc6\u6bcf\u4e00\u5757\u5bc6\u7801\u82af\u7247<\/p>\n<p>\u5c0f\u6865\u62c5\u4efb\u4f20\u8f93\u8005\uff0c\u8d1f\u8d23\u4fe1\u606f\u4f20\u8f93<\/li>\n<li>\u8f93\u5165\u683c\u5f0f\uff1a<br \/>\n\u7b2c\u4e00\u884c\u8f93\u5165\u4e00\u4e2a\u6574\u6570 N (1 \u2264 N \u2264 1000) \u8868\u793a\u82af\u7247\u6570\u91cf\u3002\u7b2c\u4e8c\u884c\u8f93\u5165 N \u4e2a\u6574\u6570 A\u2081,A\u2082,A\u2083,\u22ef,A_N (1 \u2264 A_i \u2264 10\u00b3) \u8868\u793a\u5c0f\u84dd\u7834\u8bd1\u6bcf\u5757\u82af\u7247\u7684\u65f6\u95f4\u3002\u7b2c\u4e09\u884c\u8f93\u5165 N \u4e2a\u6574\u6570 B\u2081,B\u2082,B\u2083,\u22ef,B_N (1 \u2264 B_i \u2264 10\u00b3) \u8868\u793a\u5c0f\u6865\u4f20\u8f93\u6bcf\u5757\u82af\u7247\u5bc6\u7801\u7684\u65f6\u95f4\u3002<\/li>\n<li>\u8f93\u51fa\u683c\u5f0f\uff1a<br \/>\n\u8f93\u51fa\u4e00\u4e2a\u6574\u6570\u8868\u793a\u5b8c\u6210\u6240\u6709\u5bc6\u7801\u82af\u7247\u7834\u8bd1\u4e0e\u4f20\u8f93\u6240\u9700\u7684\u6700\u77ed\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h2>\u793a\u4f8b<\/h2>\n<ul>\n<li>\u8f93\u5165\uff1a<br \/>\n4<br \/>\n1 3 5 7<br \/>\n6 5 1 4<\/li>\n<li>\u8f93\u51fa\uff1a<br \/>\n17<\/li>\n<li>\u8bf4\u660e\uff1a<br \/>\n\u4e24\u4eba\u53ef\u4ee5\u6309\u7167 (1,2,4,3) \u7684\u82af\u7247\u7f16\u53f7\u987a\u5e8f\u8fdb\u884c\u7834\u8bd1\u4f20\u8f93\uff1a\u7834\u8bd1\u82af\u72471 (1\u5355\u4f4d\u65f6\u95f4)\u4f20\u8f93\u82af\u72471 (6\u5355\u4f4d\u65f6\u95f4) \u540c\u65f6\u7834\u8bd1\u82af\u72472 (3\u5355\u4f4d\u65f6\u95f4)<\/p>\n<p>\u4f20\u8f93\u82af\u72472 (5\u5355\u4f4d\u65f6\u95f4) \u540c\u65f6\u7834\u8bd1\u82af\u72474 (7\u5355\u4f4d\u65f6\u95f4)<\/p>\n<p>\u4f20\u8f93\u82af\u72474 (4\u5355\u4f4d\u65f6\u95f4) \u540c\u65f6\u7834\u8bd1\u82af\u72473 (5\u5355\u4f4d\u65f6\u95f4)<\/p>\n<p>\u4f20\u8f93\u82af\u72473 (1\u5355\u4f4d\u65f6\u95f4)<\/p>\n<p>\u603b\u65f6\u95f4\u4e3a1 + max(6,3) + max(5,7) + max(4,5) + 1 = 17<\/li>\n<\/ul>\n<h2>\u601d\u8def<\/h2>\n<ul>\n<li><span style=\"color: #008000;\">Johnson\u7b97\u6cd5\u601d\u8def\uff0c\u6216\u8005\u8bf4\u662f\u4e00\u79cd\u8d2a\u5fc3\u601d\u8def\u3002\u4e2d\u5fc3\u5c31\u662f\u4e0d\u8981\u8ba9b\u7b49\u6216\u8005\u8bf4\u4e0d\u8981\u8ba9b\u95f2\u4e0b\u6765\u3002\u6392\u5e8f\u4f7f\u5f97a\u5c0f\u800cb\u957f\u7684\u4f18\u5148\u505a\uff0c\u4fdd\u8bc1b\u4e00\u76f4\u90fd\u6709\u4e8b\u60c5\u505a\u3002\u56e0\u4e3aa\u5fc5\u987b\u5148\u505a\uff0cb\u624d\u80fd\u505a\u3002<span style=\"color: #0000ff;\">\u65f6\u95f4\u590d\u5236\u5ea6:O(nlogn)\u3002<\/span><\/span><\/li>\n<\/ul>\n<h2>\u4ee3\u7801<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">void solve()\r\n{\r\n    int n;\r\n    cin &gt;&gt; n;\r\n    \r\n    vector&lt;PII&gt; a(n + 1);\r\n    for (int i = 1 ; i &lt;= n ; i ++ ) cin &gt;&gt; a[i].first;\r\n    for (int i = 1 ; i &lt;= n ; i ++ ) cin &gt;&gt; a[i].second;\r\n\r\n    sort(all(a) , [](const auto&amp; e1 , const auto&amp; e2){\r\n        if (e1.first &lt;= e1.second &amp;&amp; e2.first &gt; e2.second)\r\n            return true;\r\n        if (e2.first &lt;= e2.second &amp;&amp; e1.first &gt; e1.second)\r\n            return false;\r\n        if (e1.first &lt;= e1.second)\r\n            return e1.first &lt; e2.first;\r\n        else return e1.second &gt; e2.second;\r\n    });\r\n\r\n    int ans = 0, t = 0;\r\n    for (int i = 1 ; i &lt;= n ; i ++)\r\n        t += a[i].first, ans = max(ans, t) + a[i].second;\r\n    cout &lt;&lt; ans &lt;&lt; endl;\r\n    \r\n}<\/pre>\n<h1>6.\u63d2\u5165\u6570\u5b57<\/h1>\n<h2>\u9898\u76ee\u63cf\u8ff0<\/h2>\n<ul>\n<li>\u5728\u5907\u6218\u84dd\u6865\u676f\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5c0f\u84dd\u5bf9\u6570\u5b57\u53d8\u6362\u7684\u6280\u5de7\u4ea7\u751f\u4e86\u6d53\u539a\u7684\u5174\u8da3\u3002\u7ed9\u5b9a\u4e00\u4e2a\u6b63\u6574\u6570 N\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u64cd\u4f5c\u751f\u6210\u65b0\u6570\u5b57\uff1a\u5728 N \u7684\u5f00\u5934\u63d2\u5165\u4e00\u4e2a\u6570\u5b57\uff080-9\uff09\u5728 N \u7684\u7ed3\u5c3e\u63d2\u5165\u4e00\u4e2a\u6570\u5b57\uff080-9\uff09\n<p>\u5728 N \u7684\u4efb\u610f\u4e24\u4e2a\u76f8\u90bb\u6570\u5b57\u4e4b\u95f4\u63d2\u5165\u4e00\u4e2a\u6570\u5b57\uff080-9\uff09<\/p>\n<p>\u6ce8\u610f\uff1a\u751f\u6210\u7684\u65b0\u6570\u5b57\u4e0d\u80fd\u4ee5 0 \u5f00\u5934\u3002<\/li>\n<li>\u8f93\u5165\u683c\u5f0f\uff1a<br \/>\n\u8f93\u5165\u5305\u542b\u4e00\u4e2a\u6b63\u6574\u6570 N\uff081 \u2264 N \u2264 10\u00b9\u2078\uff09\uff0c\u5373\u7ed9\u5b9a\u7684\u6b63\u6574\u6570\u3002<\/li>\n<li>\u8f93\u51fa\u683c\u5f0f\uff1a<br \/>\n\u8f93\u51fa\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u901a\u8fc7\u63d2\u5165\u64cd\u4f5c\u80fd\u5f97\u5230\u7684\u4e0d\u540c\u6570\u5b57\u7684\u79cd\u7c7b\u6570\u3002<\/li>\n<\/ul>\n<h2>\u793a\u4f8b<\/h2>\n<ul>\n<li>\u8f93\u5165\uff1a9<\/li>\n<li>\u8f93\u51fa\uff1a18<\/li>\n<li>\u8bf4\u660e\uff1a<br \/>\n\u80fd\u5f97\u5230\u7684\u4e0d\u540c\u6570\u5b57\u6709\uff1a<br \/>\n19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99<\/li>\n<\/ul>\n<h2>\u601d\u8def<\/h2>\n<ul>\n<li><span style=\"color: #008000;\">\u627e\u89c4\u5f8b(\u6570\u636e\u5f88\u6c34)\u3002\u5728\u957f\u5ea6\u4e3an\u7684\u6574\u6570\u4e2d\u63d2\u5165\u4e00\u4e2a\u6570\u5b57\uff0c\u4e00\u5171\u6709n + 1 \u4e2a\u7a7a\u4f4d\uff0c\u7531\u6392\u5217\u7ec4\u5408\u7684\u77e5\u8bc6\uff0c\u4e00\u5171\u6709(n + 1) * 9\u79cd\u65b9\u6cd5\u3002<span style=\"color: #0000ff;\">\u65f6\u95f4\u590d\u6742\u5ea6O(1).<\/span><\/span><\/li>\n<li><span style=\"color: #008000;\">\u679a\u4e3e+set\u53bb\u91cd\u3002\u679a\u4e3e\u6bcf\u4e00\u4e2an + 1 \u4e2a\u4f4d\u7f6e \u4f9d\u6b21\u52a0\u51650--9\u8fd9\u51e0\u4e2a\u6570\u5b57(\u5f00\u5934\u4e3a\u4e0d\u80fd\u52a00) \u5b58\u5165set\u53bb\u91cd\u3002<\/span><br \/>\n<span style=\"color: #008000;\">\u6700\u540eset\u7684\u5bb9\u91cf\u5373\u4e3a\u7b54\u6848\u6570\u91cf\u3002<span style=\"color: #0000ff;\">\u65f6\u95f4\u590d\u6742\u5ea6O(n\u00b2).<\/span><\/span><\/li>\n<\/ul>\n<h2>\u4ee3\u7801<\/h2>\n<h4>\u89c4\u5f8b<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">void solve()\r\n{\r\n    string s;\r\n    cin &gt;&gt; s;\r\n    int n = s.size();\r\n    cout &lt;&lt; (n + 1) * 9 &lt;&lt; endl;\r\n}<\/pre>\n<h4>\u6b63\u89e3<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">void solve()\r\n{\r\n    string s;\r\n    cin &gt;&gt; s;\r\n    int n = s.size();\r\n    set&lt;string&gt; st;\r\n\r\n    for (int i = 0 ; i &lt;= n ; i ++ )\r\n    {\r\n        for (char c = '0' ; c &lt;= '9' ; c ++ )\r\n        {\r\n            if (i == 0 &amp;&amp; c == '0') continue;\r\n            string str = s.substr(0 , i) + c + s.substr(i);\r\n            st.insert(str);\r\n        }\r\n    }\r\n    cout &lt;&lt; st.size() &lt;&lt; endl;\r\n}\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h1>\u5b8c\u7ed3\u6492\u82b1\uff01<\/h1>\n","protected":false},"excerpt":{"rendered":"<p>\u8bf4\u660e \u6b64\u6587\u4ec5\u4e3a\u4f5c\u8005\u7684\u4e2a\u4eba\u89c1\u89e3\uff0c\u539f\u9898\u94fe\u63a5\uff1ahttps:\/\/www.lanqiao.cn\/oj-contest\/newbie-28\/  &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[23],"tags":[25,38],"class_list":["post-324","post","type-post","status-publish","format-standard","hentry","category-23","tag-25","tag-38"],"_links":{"self":[{"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/posts\/324","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/comments?post=324"}],"version-history":[{"count":3,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/posts\/324\/revisions"}],"predecessor-version":[{"id":328,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/posts\/324\/revisions\/328"}],"wp:attachment":[{"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/media?parent=324"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/categories?post=324"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m.qzcy2.top\/index.php\/wp-json\/wp\/v2\/tags?post=324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}