{"id":173,"date":"2022-09-24T22:07:13","date_gmt":"2022-09-24T14:07:13","guid":{"rendered":"https:\/\/h4ckm310n.com\/?p=173"},"modified":"2022-11-16T16:23:19","modified_gmt":"2022-11-16T08:23:19","slug":"%e4%ba%ac%e4%b8%9c%e7%a7%8b%e6%8b%9b%e7%ac%94%e8%af%95-20220924","status":"publish","type":"post","link":"https:\/\/h4ckm310n.com\/?p=173","title":{"rendered":"\u4eac\u4e1c\u79cb\u62db\u7b14\u8bd5 – 20220924"},"content":{"rendered":"

<\/p>\n

\u5355\u9009\u9898<\/h3>\n

1. \u5728MySQL\u7684test\u8868\u4e2d\u6709\u5b57\u6bb5(a\uff0cb\uff0cc)\uff0c\u5e76\u4e14\u6d89\u53ca\u5230\u4ee5\u4e0b\u4e09\u6761SQL\uff1a
\nselect * from test where a = 1 and b = 2;
\nselect * from test where b = 2;
\nselect * from test where b = 2 order by c desc;
\n\u8bf7\u95ee\u5728\u53ea\u5efa\u7acb\u4e00\u4e2a\u8054\u5408\u7d22\u5f15\u7684\u60c5\u6cc1\u4e0b\uff0c\u5982\u4f55\u63d0\u9ad8\u4ee5\u4e0a\u4e09\u6761SQL\u7684\u67e5\u8be2\u6548\u7387
\nA. INDEX ab(a, b)
\nB. INDEX ba(b, a)
\nC. INDEX bc(b, c)
\nD. INDEX abc(a, b, c)<\/p>\n

2. \u4e0b\u5217\u4ee3\u7801\u7684\u6267\u884c\u7ed3\u679c\u662f\u4ec0\u4e48<\/p>\n

public static void main(String[] args) {\r\n\tint d = test();\r\n\tSystem.out.println(d);\r\n}\r\n\r\npublic static int test() {\r\n\tint a = 1;\r\n\ttry {\r\n\t\ta = 2\/0;\r\n\t\treturn a;\r\n\t} catch(Exception e) {\r\n\t\ta = 3;\r\n\t\treturn a;\r\n\t} finally {\r\n\t\ta = 4;\r\n\t\tSystem.out.print(\"+nowcoder\");\r\n\t\treturn a;\r\n\t}\r\n}\r\n<\/pre>\n
A. 3+nowcoder
\nB. +nowcoder3
\nC. +nowcoder4
\nD. 4+nowcoder<\/p>\n
3. \u4e00\u4e2a\u6570\u636e\u957f\u5ea6\u4e3a4000B\uff0c\u9996\u90e8\u957f\u5ea6\u4e3a20B\uff0cMTU\u4e3a1500B\uff0c\u95ee\u603b\u5171\u9700\u8981\u5212\u5206\u4e3a\uff08\uff09\u7ec4\uff0c\u7b2c\uff08\uff09\u7ec4\u7684\u7247\u504f\u79fb\u4e3a370
\nA. 3, 3
\nB. 2, 1
\nC. 1, 1
\nD. 4, 3<\/p>\n
4. \u5047\u8bbedemo.c\u6587\u4ef6\u7684\u521d\u59cb\u6743\u9650\u4e3arw-rw-rw-\uff0c\u6267\u884cchmod go-w demo.c\u540e\uff0cdemo.c\u6587\u4ef6\u7684\u6743\u9650\u5c06\u53d8\u4e3a\uff08\uff09
\nA. rwxrwxrwx
\nB. r–r–r–
\nC. rw-rw-r–
\nD. rw-r–r–<\/p>\n
5. \u4e0b\u56fe\u4e3a\u4e00\u4e2a\u5e26\u6743\u65e0\u5411\u56fe\uff0c\u4e0b\u5217\u9009\u9879\u4e2d\uff0c\u54ea\u4e00\u4e2a\u662f\u5b83\u7684\u6700\u5c0f\u4ee3\u4ef7\u751f\u6210\u6811
\n\"\"<\/p>\n
A. \"\"
\nB. \"\"
\nC. \"\"
\nD. \"\"<\/p>\n
6. \u5173\u4e8eJava IO\uff0c\u4e0b\u5217\u8bf4\u6cd5\u9519\u8bef\u7684\u662f
\nA. IO\u6d41\u6309\u7167\u6d41\u5bf9\u8c61\u4e3b\u8981\u5206\u4e3a\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u3002
\nB. IO\u6d41\u6309\u7167\u6d41\u5411\u4e0d\u540c\uff0c\u5206\u4e3a\u8f93\u5165\u6d41\u3001\u8f93\u51fa\u6d41\u3002
\nC. InputStream\u548cOutputStream\u662f\u5b57\u8282\u6d41\u7684\u57fa\u7c7b\uff0cReader\u548cWriter\u662f\u5b57\u7b26\u6d41\u7684\u57fa\u7c7b\u3002
\nD. \u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u90fd\u53ef\u4ee5\u5904\u7406\u4efb\u4f55\u7684\u6570\u636e\uff0c\u5305\u62ec\u56fe\u7247\u548c\u89c6\u9891\u7b49\u3002<\/p>\n
7. \u5047\u5982\u4e00\u4e2a\u5e8f\u5217\u7684\u8f93\u5165\u5e8f\u5217\u4e3a1234\uff0c\u5f53\u8f93\u51fa\u5e8f\u5217\u53d8\u4e3a3241\uff08\u5728\u8fdb\u7684\u8fc7\u7a0b\u4e2d\u5141\u8bb8\u51fa\u6808\uff09\uff0c\u5219\u7ecf\u8fc7\u7684\u6808\u64cd\u4f5c\u5177\u4f53\u4e3a
\nA. push push push pop push pop pop pop
\nB. push push push push pop pop pop pop
\nC. push push push pop pop push pop pop
\nD. push push push pop pop pop push pop<\/p>\n
8. \u4ee5\u4e0b\u5173\u4e8eCMS\u8bf4\u6cd5\u6b63\u786e\u7684\u662f
\nA. CMS\u5783\u573e\u56de\u6536\u8fc7\u7a0b\u4e2d\u53ea\u4f1a\u53d1\u751f\u4e00\u6b21STW\u4e8b\u4ef6
\nB. \u6709\u4e00\u4e9b\u5bf9\u8c61\uff0c\u5728\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\u662f\u65b0\u751f\u4ee3\uff0c\u800c\u5728\u9884\u6e05\u7406\u9636\u6bb5\u53d8\u6210\u8001\u5e74\u4ee3\u5bf9\u8c61\uff0c\u4ed6\u4eec\u4f1a\u88ab\u6f0f\u6807\uff0c\u4e0b\u4e00\u6b21\u6e05\u7406\u65f6\u9700\u8981\u91cd\u65b0\u626b\u63cf\u8001\u5e74\u4ee3
\nC. \u91cd\u65b0\u6807\u8bb0\u9636\u6bb5\u4f1a\u53d1\u751fSTW\u4e8b\u4ef6
\nD. \u5728\u521d\u59cb\u6807\u8bb0\u9636\u6bb5\uff0c\u6807\u8bb0\u76ee\u6807\u662f\u5e74\u8f7b\u4ee3\u4e2d\u7684\u6d3b\u7740\u7684\u5bf9\u8c61<\/p>\n
9. \u8bbe\u65e0\u5411\u56fe\u7684\u90bb\u63a5\u77e9\u9635A\u5982\u4e0b\u6240\u793a\uff0c\u4f7f\u7528Kruskal\u7b97\u6cd5\u6c42\u89e3\u5b83\u7684\u6700\u5c0f\u751f\u6210\u6811\uff0c\u6700\u5c0f\u751f\u6210\u6811\u7684\u5927\u5c0f\u4e3a
\n\"\"
\nA. 20
\nB. 23
\nC. 26
\nD. 22<\/p>\n
10. \u4e0b\u5217\u9009\u9879\u4e0d\u662fJava\u7ebf\u7a0b\u72b6\u6001\u7684\u662f
\nA. NEW
\nB. BLOCKED
\nC. WAITING
\nD. RUNNING<\/p>\n
11. \u5728MySQL\u4e2d\u8fdb\u884c\u67e5\u8be2\uff0c\u82e5\u53ea\u626b\u63cf\u7d22\u5f15\u4e0d\u8003\u8651\u56de\u8868\u80fd\u591f\u5e26\u6765\u8bf8\u591a\u4f18\u52bf\uff0c\u4e0b\u5217\u4e0d\u5c5e\u4e8e\u7d22\u5f15\u626b\u63cf\u5e26\u6765\u7684\u4f18\u52bf\u662f
\nA. \u9488\u5bf9\u8bfb\u5199\u5bc6\u96c6\u7684\u8303\u56f4\u67e5\u8be2\u6765\u8bf4\u8bfb\u5199\u8d44\u6e90\u635f\u8017\u4f1a\u964d\u4f4e
\nB. \u964d\u4f4e\u6570\u636e\u8bbf\u95ee\u91cf\uff0c\u964d\u4f4e\u6570\u636e\u5e93\u8868\u7684\u8d1f\u8f7d
\nC. \u80fd\u591f\u4f7f\u5f97\u67e5\u8be2\u66f4\u52a0\u7cbe\u51c6
\nD. \u80fd\u591f\u5e2e\u52a9\u4e00\u4e9b\u53ea\u4f9d\u8d56\u7d22\u5f15\u7684\u5b58\u50a8\u5f15\u64ce\u8fdb\u884c\u64cd\u4f5c<\/p>\n
12. \u67d0\u8ba1\u7b97\u673a\u91c7\u7528\u4e8c\u7ea7\u9875\u8868\u7684\u5206\u9875\u5b58\u50a8\u7ba1\u7406\u65b9\u5f0f\uff0c\u6309\u5b57\u8282\u7f16\u5740\uff0c\u9875\u5927\u5c0f\u4e3a2^11B\uff0c\u9875\u8868\u9879\u5927\u5c0f\u4e3a4B\uff0c\u903b\u8f91\u5730\u5740\u7ed3\u6784\u4e3a\uff1a
\n\u9875\u76ee\u5f55\u53f7 | \u9875\u53f7 | \u9875\u5185\u504f\u79fb\u91cf
\n\u903b\u8f91\u5730\u5740\u7a7a\u95f4\u5927\u5c0f\u4e3a2^16\u9875\uff0c\u5219\u8868\u793a\u6574\u4e2a\u903b\u8f91\u5730\u5740\u7a7a\u95f4\u7684\u9875\u76ee\u5f55\u8868\u4e2d\u5305\u542b\u8868\u9879\u7684\u4e2a\u6570\u81f3\u5c11\u662f
\nA. 64
\nB. 128
\nC. 256
\nD. 512<\/p>\n
13. \u7ed9\u5b9a\u4e00\u9012\u5f52\u7b97\u6cd5\u7684\u7a0b\u5e8f\u6bb5\u5982\u4e0b\uff0c\u5219\u8be5\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a<\/p>\n
void f(int l, int r)\r\n{\r\n\tfor (int i = 1; i <= r; i++)\r\n\t\tfor (int j = 1; j <= n; i *= 2)\r\n\t\t\ta[i] *= j;\r\n\tif(l == r) return ;\r\n\tint mid = (l + r) \/ 2;\r\n\tf(l, mid);\r\n\tf(mid + 1, r);\r\n\treturn ;\r\n}\r\n\r\nint main()\r\n{\r\n\tn = r - l + 1;\r\n\tf(l, r);\r\n}\r\n<\/pre>\n
A. O(nlogn)
\nB. O(n^2)
\nC. O(n^2(logn)^2)
\nD. O(n(logn)^2)<\/p>\n
14. \u5728Linux\u4e2d\uff0c\u4ee5\u4e0b\u54ea\u4e2a\u73af\u5883\u53d8\u91cf\u8868\u793a\u5f53\u524d\u73af\u5883\u4e2d\u5386\u53f2\u547d\u4ee4\u7684\u6570\u91cf
\nA. $HISTSIZE
\nB. $HISTORYSIZE
\nC. $HSIZE
\nD. $HISSIZE<\/p>\n
15. \u6839\u636e\u4f20\u8f93\u6280\u672f\uff0c\u7f51\u7edc\u53c8\u5206\u4e3a\u5e7f\u64ad\u5f0f\u7f51\u7edc\u548c\u70b9\u5bf9\u70b9\u7f51\u7edc\uff0c\u4e0b\u9762\u8bf4\u6cd5\u9519\u8bef\u7684\u662f
\nA. \u5e7f\u64ad\u5f0f\u7f51\u7edc\u6ca1\u6709\u8def\u7531\u9009\u62e9\u95ee\u9898
\nB. \u70b9\u5bf9\u70b9\u7f51\u7edc\u4e0d\u5b58\u5728\u4fe1\u9053\u5171\u4eab\u4e0e\u590d\u7528\u7684\u60c5\u51b5
\nC. \u70b9\u5bf9\u70b9\u7f51\u7edc\u4e0d\u5b58\u5728\u4e2d\u592e\u670d\u52a1\u5668
\nD. \u5e7f\u64ad\u5f0f\u7f51\u7edc\u4e0d\u7528\u670d\u52a1\u8bbf\u95ee\u7ed3\u70b9<\/p>\n
16. Java9\u7248\u672c\u4e2d\u6709\u5982\u4e0b\u4ee3\u7801\uff0c\u8fd0\u884c\u7a0b\u5e8f\uff0c\u540e\u4e24\u884c\u4ee3\u7801\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48<\/p>\n
import java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class ArrayListTest {\r\n\tpublic static void main(String[] args) {\r\n\t\tList allElements = List.of(\"a\", \"b\", \"c\", \"d\", \"e\", \"f\");\r\n\t\tList allList = new ArrayList<>(allElements);\r\n\t\tSystem.out.println(allList);\r\n\t\tList subList = allList.subList(1, 3);\r\n\t\tSystem.out.println(subList);\r\n\t\tsubList.set(0, \"sub\");\r\n\t\tSystem.out.println(\"sub list : \" + subList);\r\n\t\tSystem.out.println(\"all list : \" + allList);\r\n\t}\r\n}\r\n<\/pre>\n
A.
\nsub list : [sub, c]
\nall list : [a, sub, c, d, e, f]
\nB.
\nsub list : [sub, c]
\nall list : [a, b, c, d, e, f]
\nC.
\nsub list : [sub, c]
\nall list : [sub, b, c, d, e, f]
\nD.
\nsub list : [b, c]
\nall list : [sub, b, c, d, e, f]<\/p>\n
17. \u5173\u4e8e\u7ebf\u7a0b\u7684\u751f\u547d\u5468\u671f\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u9519\u8bef\u7684\u662f
\nA. \u7ebf\u7a0b\u7684\u751f\u547d\u5468\u671f\u4e3b\u8981\u6709\u521d\u59cb\u72b6\u6001\u3001\u8fd0\u884c\u72b6\u6001\u3001\u5c31\u7eea\u72b6\u6001\u3001\u7b49\u5f85\u72b6\u6001\u3001\u963b\u585e\u72b6\u6001\u3001\u8d85\u65f6\u7b49\u5f85\u72b6\u6001\u3001\u7ec8\u6b62\u72b6\u6001\uff0c
\nB. \u8fd0\u884c\u72b6\u6001\u548c\u5c31\u7eea\u72b6\u6001\u53ef\u4ee5\u76f8\u4e92\u8f6c\u5316
\nC. \u7b49\u5f85\u72b6\u6001\u4e0d\u53ef\u4ee5\u548c\u963b\u585e\u72b6\u6001\u76f8\u4e92\u8f6c\u5316
\nD. \u7b49\u5f85\u72b6\u6001\u548c\u8d85\u65f6\u7b49\u5f85\u72b6\u6001\u53ef\u4ee5\u76f8\u4e92\u8f6c\u5316<\/p>\n
18. \u4e0b\u5217\u9009\u9879\u4e2d\uff0c\u4e0d\u5728\u6838\u5fc3\u6001\u6267\u884c\u7684\u662f
\nA. \u547d\u4ee4\u89e3\u91ca\u7a0b\u5e8f
\nB. \u8fdb\u7a0b\u8c03\u5ea6\u7a0b\u5e8f
\nC. \u65f6\u949f\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f
\nD. \u7f3a\u9875\u5904\u7406\u7a0b\u5e8f<\/p>\n
19. MySQL\u4e2d\u5220\u9664student_table\u8868\u7684\u7ec4\u5408\uff08\u8054\u5408\uff09\u7d22\u5f15index_name_birth_age\uff0c\u4ee5\u4e0bSQL\u6b63\u786e\u7684\u662f
\nA. ALTER TABLE student table DROP index_name_birth_age
\nB. ALTER TABLE student table DROP combine index index_name_birth_age
\nC. ALTER TABLE student table DROP combine index_name_birth_age
\nD. ALTER TABLE student table DROP index index_name_birth_age<\/p>\n
20. \u4e0b\u9762Java\u4ee3\u7801\u7684\u8fd0\u884c\u7ed3\u679c\u4e3a<\/p>\n
class test\r\n{\r\n\tpublic static void main (String[] args)\r\n\t{\r\n\t\tString s1 = new String(\"a\") + new String(\"b\");\r\n\t\tString s2 = \"ab\";\r\n\t\tString s3 = s1.intern();\r\n\t\tSystem.out.println(s1.hashCode() == s2.hashCode());\r\n\t\tSystem.out.println(s1 == s3);\r\n\t}\r\n}\r\n<\/pre>\n
A.
\nfalse
\nfalse
\nB.
\ntrue
\ntrue
\nC.
\ntrue
\nfalse
\nD.
\nfalse
\ntrue<\/p>\n
\u7b97\u6cd5\u9898<\/h3>\n
1. \u5c0f\u7ea2\u5403\u7cd6\u679c<\/h4>\n
\u9898\u76ee\u63cf\u8ff0\uff1a
\n\u5c0f\u7ea2\u62ff\u5230\u4e86\u8bb8\u591a\u7cd6\u679c\uff0c\u5979\u5e0c\u671b\u5403\u6389\u4e00\u4e9b\u7cd6\u679c\uff0c\u4f46\u6bcf\u79cd\u7cd6\u679c\u81f3\u5c11\u9700\u8981\u7559\u4e0b\u4e00\u4e2a\u4f5c\u4e3a\u6536\u85cf\uff08\u6bcf\u79cd\u7cd6\u679c\u90fd\u4e0d\u80fd\u5403\u5149\uff09\uff0c\u5c0f\u7ea2\u60f3\u77e5\u9053\uff0c\u81ea\u5df1\u6700\u591a\u53ef\u4ee5\u5403\u591a\u5c11\u7cd6\u679c\uff1f<\/p>\n
\u8f93\u5165\u63cf\u8ff0\uff1a
\n\u7b2c\u4e00\u884c\u8f93\u5165\u4e00\u4e2a\u6b63\u6574\u6570n\uff0c\u4ee3\u8868\u7cd6\u679c\u7684\u6570\u91cf\u3002
\n\u7b2c\u4e8c\u884c\u8f93\u5165\u51e0\u4e2a\u6b63\u6574\u6570ai\uff0c\u4ee3\u8868\u6bcf\u4e2a\u7cd6\u679c\u7684\u79cd\u7c7b\u3002
\n1\u2264n,ai\u2264100<\/p>\n
\u8f93\u51fa\u63cf\u8ff0\uff1a
\n\u8f93\u51fa\u4e00\u4e2a\u6574\u6570\uff0c\u4ee3\u8868\u5c0f\u7ea2\u53ef\u4ee5\u5403\u6389\u7cd6\u679c\u7684\u6700\u5927\u6570\u91cf\u3002<\/p>\n
\u793a\u4f8b1\uff1a
\n\u8f93\u5165\uff1a
\n1
\n1 2 3 4 5
\n\u8f93\u51fa\uff1a
\n0
\n\u8bf4\u660e\uff1a
\n\u6bcf\u79cd\u7cd6\u679c\u90fd\u53ea\u6709\u4e00\u4e2a\uff0c\u56e0\u6b64\u65e0\u6cd5\u5403\u4efb\u4f55\u7cd6\u679c\u3002<\/p>\n
\u793a\u4f8b2\uff1a
\n\u8f93\u5165\uff1a
\n4
\n2 1 1 2
\n\u8f93\u51fa\uff1a
\n2
\n\u8bf4\u660e\uff1a
\n\u7c7b\u578b1\u7684\u7cd6\u679c\u548c\u7c7b\u578b2\u7684\u7cd6\u679c\u5404\u5403\u4e00\u4e2a\uff0c\u8fd9\u6837\u6bcf\u4e2a\u90fd\u7559\u4e0b\u4e86\u4e00\u4e2a\u3002<\/p>\n
2. \u5c0f\u7ea2\u7684\u5b50\u5e8f\u5217\u5212\u5206<\/h4>\n
\u9898\u76ee\u63cf\u8ff0\uff1a
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\n1\u2264k\u2264n\u226410^5
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\u8f93\u51fa\u63cf\u8ff0\uff1a
\n\u4e00\u4e2a\u6574\u6570\uff0c\u4ee3\u8868\u6700\u5927\u7684\u6781\u5dee\u4e4b\u548c\u3002<\/p>\n
\u793a\u4f8b1\uff1a
\n\u8f93\u5165\uff1a
\n5 3
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\n6
\n\u8bf4\u660e\uff1a
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\n5 3
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3. \u5c0f\u7ea2\u7684\u4e58\u52a0\u64cd\u4f5c<\/h4>\n
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\n1. \u4f7fx\u4e58\u4ee52\u3002
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\n1\u2264t\u226420
\n1\u2264x,y\u226410^4
\n\u4fdd\u8bc1x\uff1cy<\/p>\n
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