Day15-Task20.有效的括号

题目描述

20.有效的括号

给定一个只包括 ‘(’,’)’,’{’,’}’,’[’,’]’ 的字符串,判断字符串是否有效。
有效字符串需满足:
左括号必须用相同类型的右括号闭合。
左括号必须以正确的顺序闭合。
注意空字符串可被认为是有效字符串。

来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/valid-parentheses
著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。

示例1

输入: “()”
输出: true

示例2

输入: “()[]{}”
输出: true

示例3

输入: “(]”
输出: false

示例4

输入: “([)]”
输出: false

示例5

输入: “{[]}”
输出: true

解题思路
栈的应用

方法有很多,但最基本的还是栈 ***(stack)***的应用

  • 若是右括号则放入栈中
  • 左括号则与栈顶元素匹配,若成功则继续,若失败则直接 return false
  • 为防止第一个字符串第一个元素为右括号而导致的栈顶指针为空,提前在栈中放一个 flag $
  • 最后检查栈顶元素,若 S.top == '$'return true , 否则 return false
代码如下
class Solution {
public:
    bool isValid(string s) {
        stack<char> S;
        S.push('$');
        for(int i = 0; i < s.length(); i++)
        {
            if(s[i] == '(' || s[i] == '[' || s[i] == '{')
            {
                S.push(s[i]);
            }
            else if(s[i] == ')' && S.top() == '(')
            {
                S.pop();
                continue;
            }
            else if(s[i] == ']' && S.top() == '[')
            {
                S.pop();
                continue;
            }
            else if(s[i] == '}' && S.top() == '{')
            {
                S.pop();
                continue;
            }
            else
            {
                return false;
            }
        }
        if(S.top() == '$')
        {
            return true;
        }
        else
        {
            return false;    
        }
    }
};
执行结果

在这里插入图片描述

package com.edu.test; import com.edu.po.Person; import com.edu.utils.HiveUtils; import com.edu.utils.JdbcUtils; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; /* * 任务说明: * 1. 把 hive 的表读取出来。 * 2. 把数据转入到 mysql。 * 3. 可以在 web 工程中读取 mysql 数据。 * (web 工程有 jar 冲突问题, 这里间接去读取 hive 数据) * 4. 展示在页面。 */ public class Task1 { /* 数据项: [day_time], [total_msg_cnt] */ static List<Person> getHiveData() throws SQLException { Connection conn = HiveUtils.getConnection(); String SQL = "SELECT CAST(day_time AS STRING) AS day_time, total_msg_cnt FROM hive_table;"; PreparedStatement psmt = conn.prepareStatement(SQL); ResultSet rs = psmt.executeQuery(); List<Person> list = new ArrayList(); while( rs.next() ){ Person p = packPerson( rs ); list.add( p ); System.out.println( p ); } rs.close(); psmt.close(); HiveUtils.closeConnection(); //关闭 hive 连接 System.out.println("+-----------------------------------+"); System.out.println("{TASK1-HIVE}运行完成.."); System.out.println("+-----------------------------------+"); return list; } static Person packPerson(ResultSet rs) throws SQLException { Person p = new Person(); String day_time = rs.getString(1); Long total_msg_cnt = rs.getLong(2); p.setDay_time( day_time ); p.setTotal_msg_cnt( total_msg_cnt ); return p; } public static void main(String[] args) throws SQLException { List<Person> hiveData = getHiveData(); for (Person p : hiveData) { if (p.getDay_time() == null || p.getDay_time().isEmpty()) { System.out.println("发现空值:" + p); } } //2.转存到 MYSQL 中。 writeToMYSQL(hiveData); } /* 2.转存到 MYSQL 中。 */ static void writeToMYSQL(List<Person> hiveData) throws SQLException { // 1. 获取 MySQL 连接 Connection conn = JdbcUtils.getConnection(); String SQL = "INSERT INTO total_msg_cnt (day_time, total_msg_cnt) VALUES (?, ?)"; PreparedStatement psmt = conn.prepareStatement(SQL); for (Person p : hiveData) { psmt.setString(1, p.getDay_time()); psmt.setLong(2, p.getTotal_msg_cnt()); psmt.addBatch(); } psmt.executeBatch(); psmt.close(); JdbcUtils.closeConnection(); System.out.println("+-----------------------------------+"); System.out.println("{TASK1-MYSQL}运行完成."); System.out.println("+-----------------------------------+"); } } D:\flinkjava\Java\jdk1.8.0_281\bin\java.exe "-javaagent:D:\jetbra\IntelliJ IDEA 2023.2.8\lib\idea_rt.jar=51965:D:\jetbra\IntelliJ IDEA 2023.2.8\bin" -Dfile.encoding=UTF-8 -classpath 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jar;C:\Users\sb171\.m2\repository\org\apache\thrift\libthrift\0.9.3\libthrift-0.9.3.jar;C:\Users\sb171\.m2\repository\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;C:\Users\sb171\.m2\repository\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;C:\Users\sb171\.m2\repository\log4j\log4j\1.2.16\log4j-1.2.16.jar;C:\Users\sb171\.m2\repository\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;C:\Users\sb171\.m2\repository\org\apache\curator\curator-framework\2.12.0\curator-framework-2.12.0.jar;C:\Users\sb171\.m2\repository\org\apache\curator\curator-client\2.12.0\curator-client-2.12.0.jar;C:\Users\sb171\.m2\repository\org\slf4j\slf4j-api\1.7.10\slf4j-api-1.7.10.jar;C:\Users\sb171\.m2\repository\org\apache\hive\hive-upgrade-acid\3.1.2\hive-upgrade-acid-3.1.2.jar;C:\Users\sb171\.m2\repository\mysql\mysql-connector-java\8.0.30\mysql-connector-java-8.0.30.jar;C:\Users\sb171\.m2\repository\com\google\protobuf\protobuf-java\3.19.4\protobuf-java-3.19.4.jar com.edu.test.Task1 Exception in thread "main" org.apache.hive.service.cli.HiveSQLException: Error while compiling statement: FAILED: ParseException line 1:74 cannot recognize input near 'hive_table' ';' '<EOF>' in joinSource at org.apache.hive.jdbc.Utils.verifySuccess(Utils.java:300) at org.apache.hive.jdbc.Utils.verifySuccessWithInfo(Utils.java:286) at org.apache.hive.jdbc.HiveStatement.runAsyncOnServer(HiveStatement.java:324) at org.apache.hive.jdbc.HiveStatement.execute(HiveStatement.java:265) at org.apache.hive.jdbc.HiveStatement.executeQuery(HiveStatement.java:497) at org.apache.hive.jdbc.HivePreparedStatement.executeQuery(HivePreparedStatement.java:112) at com.edu.test.Task1.getHiveData(Task1.java:31) at com.edu.test.Task1.main(Task1.java:59) Caused by: org.apache.hive.service.cli.HiveSQLException: Error while compiling statement: FAILED: ParseException line 1:74 cannot recognize input near 'hive_table' ';' '<EOF>' in joinSource at org.apache.hive.service.cli.operation.Operation.toSQLException(Operation.java:335) at org.apache.hive.service.cli.operation.SQLOperation.prepare(SQLOperation.java:199) at org.apache.hive.service.cli.operation.SQLOperation.runInternal(SQLOperation.java:260) at org.apache.hive.service.cli.operation.Operation.run(Operation.java:247) at org.apache.hive.service.cli.session.HiveSessionImpl.executeStatementInternal(HiveSessionImpl.java:541) at org.apache.hive.service.cli.session.HiveSessionImpl.executeStatementAsync(HiveSessionImpl.java:527) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:78) at org.apache.hive.service.cli.session.HiveSessionProxy.access$000(HiveSessionProxy.java:36) at org.apache.hive.service.cli.session.HiveSessionProxy$1.run(HiveSessionProxy.java:63) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1754) at org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:59) at com.sun.proxy.$Proxy37.executeStatementAsync(Unknown Source) at org.apache.hive.service.cli.CLIService.executeStatementAsync(CLIService.java:312) at org.apache.hive.service.cli.thrift.ThriftCLIService.ExecuteStatement(ThriftCLIService.java:562) at org.apache.hive.service.rpc.thrift.TCLIService$Processor$ExecuteStatement.getResult(TCLIService.java:1557) at org.apache.hive.service.rpc.thrift.TCLIService$Processor$ExecuteStatement.getResult(TCLIService.java:1542) at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39) at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39) at org.apache.hive.service.auth.TSetIpAddressProcessor.process(TSetIpAddressProcessor.java:56) at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.RuntimeException: org.apache.hadoop.hive.ql.parse.ParseException:line 1:74 cannot recognize input near 'hive_table' ';' '<EOF>' in joinSource at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:223) at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:74) at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:67) at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:616) at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1826) at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:1773) at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:1768) at org.apache.hadoop.hive.ql.reexec.ReExecDriver.compileAndRespond(ReExecDriver.java:126) at org.apache.hive.service.cli.operation.SQLOperation.prepare(SQLOperation.java:197) ... 27 more Process finished with exit code 1
06-30
LAMMPS (27 May 2021) OMP_NUM_THREADS environment is not set. Defaulting to 1 thread. (src/comm.cpp:98) using 1 OpenMP thread(s) per MPI task # CPU-only模式测试脚本 (24线程) units metal atom_style charge boundary p p p neighbor 0.3 bin neigh_modify delay 5 every 1 check yes package omp 24 # 启用24个OpenMP线程 set 24 OpenMP thread(s) per MPI task using multi-threaded neighbor list subroutines # 创建原子结构 region box block 0 200 0 200 0 200 create_box 6 box Created orthogonal box = (0.0000000 0.0000000 0.0000000) to (200.00000 200.00000 200.00000) 1 by 1 by 1 MPI processor grid create_atoms 1 random 1030 8763 box Created 1030 atoms create_atoms CPU = 0.000 seconds create_atoms 2 random 1213 23456 box Created 1213 atoms create_atoms CPU = 0.000 seconds create_atoms 3 random 1833 34567 box Created 1833 atoms create_atoms CPU = 0.000 seconds create_atoms 4 random 697 45678 box Created 697 atoms create_atoms CPU = 0.000 seconds create_atoms 5 random 88 56789 box Created 88 atoms create_atoms CPU = 0.000 seconds create_atoms 6 random 138 67890 box Created 138 atoms create_atoms CPU = 0.000 seconds # 设置原子属性和电荷 mass 1 40.08 # Ca mass 2 19.00 # F mass 3 16.00 # O mass 4 26.98 # Al mass 5 24.30 # Mg mass 6 28.09 # Si set type 1 charge +2.0 # Ca2+ Setting atom values ... 1030 settings made for charge set type 2 charge -1.0 # F- Setting atom values ... 1213 settings made for charge set type 3 charge -2.0 # O2- Setting atom values ... 1833 settings made for charge set type 4 charge +3.0 # Al3+ Setting atom values ... 697 settings made for charge set type 5 charge +2.0 # Mg2+ Setting atom values ... 88 settings made for charge set type 6 charge +4.0 # Si4+ Setting atom values ... 138 settings made for charge # 势函数设置 pair_style buck/coul/long/omp 10.0 10.0 kspace_style pppm 0.0001 pair_coeff 1 1 329193.320 0.16 4.3369 # Ca-Ca pair_coeff 1 2 496191.600 0.165 8.67 # Ca-F pair_coeff 1 3 718136.080 0.165 8.67 # Ca-O pair_coeff 1 4 36918.570 0.16 0.0 # Ca-Al pair_coeff 1 5 67720.910 0.16 0.8674 # Ca-Mg pair_coeff 1 6 26674.680 0.16 0.0 # Ca-Si pair_coeff 2 2 730722.800 0.17 17.34 # F-F pair_coeff 2 3 1046135.400 0.17 17.34 # F-O pair_coeff 2 4 59481.584 0.165 0.0 # F-Al pair_coeff 2 5 107085.519 0.165 1.7347 # F-Mg pair_coeff 2 6 43406.000 0.165 0.0 # F-Si pair_coeff 3 3 1497693.500 0.17 17.34 # O-O pair_coeff 3 4 86057.580 0.165 0.0 # O-Al pair_coeff 3 5 154984.640 0.165 1.7347 # O-Mg pair_coeff 3 6 62821.410 0.165 0.0 # O-Si pair_coeff 4 4 4142.149 0.16 0.0 # Al-Al pair_coeff 4 5 7600.000 0.16 0.0 # Al-Mg pair_coeff 4 6 2990.000 0.16 0.0 # Al-Si pair_coeff 5 5 13931.400 0.16 0.1735 # Mg-Mg pair_coeff 5 6 5489.810 0.16 0.0 # Mg-Si pair_coeff 6 6 2163.320 0.16 0.0 # Si-Si # 测试流程 reset_timestep 0 velocity all create 4000.0 12345 minimize 1.0e-5 1.0e-7 1000 10000 WARNING: Using 'neigh_modify every 1 delay 0 check yes' setting during minimization (src/min.cpp:189) PPPM initialization ... using 12-bit tables for long-range coulomb (src/kspace.cpp:340) G vector (1/distance) = 0.25738067 grid = 96 96 96 stencil order = 5 estimated absolute RMS force accuracy = 0.001834551 estimated relative force accuracy = 0.00012740252 using double precision FFTW3 3d grid and FFT values/proc = 1030301 884736 Last active /omp style is pair_style buck/coul/long/omp Neighbor list info ... update every 1 steps, delay 0 steps, check yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 10.3 ghost atom cutoff = 10.3 binsize = 5.15, bins = 39 39 39 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair buck/coul/long/omp, perpetual attributes: half, newton on, omp pair build: half/bin/atomonly/newton/omp stencil: half/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 139.2 | 139.2 | 139.2 Mbytes Step Temp E_pair E_mol TotEng Press 0 4000 161444.12 0 164028.28 30975.418 1000 4000 -73046.543 0 -70462.374 -72.475049 Loop time of 74.6223 on 24 procs for 1000 steps with 4999 atoms 35.5% CPU use with 1 MPI tasks x 24 OpenMP threads Minimization stats: Stopping criterion = max iterations Energy initial, next-to-last, final = 161444.115470866 -73017.6575217809 -73046.5432936927 Force two-norm initial, final = 703323.08 66.571396 Force max component initial, final = 473215.26 23.702297 Final line search alpha, max atom move = 0.0033242332 0.078791963 Iterations, force evaluations = 1000 1008 MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.41604 | 0.41604 | 0.41604 | 0.0 | 0.56 Kspace | 73.642 | 73.642 | 73.642 | 0.0 | 98.69 Neigh | 0.18951 | 0.18951 | 0.18951 | 0.0 | 0.25 Comm | 0.035384 | 0.035384 | 0.035384 | 0.0 | 0.05 Output | 7.41e-05 | 7.41e-05 | 7.41e-05 | 0.0 | 0.00 Modify | 0.19129 | 0.19129 | 0.19129 | 0.0 | 0.26 Other | | 0.1481 | | | 0.20 Nlocal: 4999.00 ave 4999 max 4999 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 1756.00 ave 1756 max 1756 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 7283.00 ave 7283 max 7283 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 7283 Ave neighs/atom = 1.4568914 Neighbor list builds = 505 Dangerous builds = 15 # 预热运行 fix warmup all nve run 10 PPPM initialization ... using 12-bit tables for long-range coulomb (src/kspace.cpp:340) G vector (1/distance) = 0.25738067 grid = 96 96 96 stencil order = 5 estimated absolute RMS force accuracy = 0.001834551 estimated relative force accuracy = 0.00012740252 using double precision FFTW3 3d grid and FFT values/proc = 1030301 884736 Last active /omp style is pair_style buck/coul/long/omp Per MPI rank memory allocation (min/avg/max) = 138.1 | 138.1 | 138.1 Mbytes Step Temp E_pair E_mol TotEng Press 1000 4000 -73046.543 0 -70462.374 -72.475049 1010 3601.0323 -72784.93 0 -70458.512 -307.51509 Loop time of 0.71717 on 24 procs for 10 steps with 4999 atoms Performance: 1.205 ns/day, 19.921 hours/ns, 13.944 timesteps/s 37.0% CPU use with 1 MPI tasks x 24 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.0036188 | 0.0036188 | 0.0036188 | 0.0 | 0.50 Kspace | 0.70951 | 0.70951 | 0.70951 | 0.0 | 98.93 Neigh | 0.0011555 | 0.0011555 | 0.0011555 | 0.0 | 0.16 Comm | 0.0002097 | 0.0002097 | 0.0002097 | 0.0 | 0.03 Output | 7.08e-05 | 7.08e-05 | 7.08e-05 | 0.0 | 0.01 Modify | 0.0023679 | 0.0023679 | 0.0023679 | 0.0 | 0.33 Other | | 0.0002373 | | | 0.03 Nlocal: 4999.00 ave 4999 max 4999 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 1754.00 ave 1754 max 1754 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 7283.00 ave 7283 max 7283 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 7283 Ave neighs/atom = 1.4568914 Neighbor list builds = 2 Dangerous builds = 2 unfix warmup # 性能测试 - 使用系统时间测量 reset_timestep 0 variable start_time equal time() # 记录开始时间 fix benchmark all nve run 100 PPPM initialization ... using 12-bit tables for long-range coulomb (src/kspace.cpp:340) G vector (1/distance) = 0.25738067 grid = 96 96 96 stencil order = 5 estimated absolute RMS force accuracy = 0.001834551 estimated relative force accuracy = 0.00012740252 using double precision FFTW3 3d grid and FFT values/proc = 1030301 884736 Last active /omp style is pair_style buck/coul/long/omp Per MPI rank memory allocation (min/avg/max) = 138.1 | 138.1 | 138.1 Mbytes Step Temp E_pair E_mol TotEng Press 0 3601.0323 -72784.93 0 -70458.512 -307.51509 100 6387.3593 -74588.666 0 -70462.163 91.600785 Loop time of 7.21601 on 24 procs for 100 steps with 4999 atoms Performance: 1.197 ns/day, 20.044 hours/ns, 13.858 timesteps/s 8.7% CPU use with 1 MPI tasks x 24 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.030583 | 0.030583 | 0.030583 | 0.0 | 0.42 Kspace | 7.1545 | 7.1545 | 7.1545 | 0.0 | 99.15 Neigh | 0.0067331 | 0.0067331 | 0.0067331 | 0.0 | 0.09 Comm | 0.0019693 | 0.0019693 | 0.0019693 | 0.0 | 0.03 Output | 7.72e-05 | 7.72e-05 | 7.72e-05 | 0.0 | 0.00 Modify | 0.019508 | 0.019508 | 0.019508 | 0.0 | 0.27 Other | | 0.002622 | | | 0.04 Nlocal: 4999.00 ave 4999 max 4999 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 1760.00 ave 1760 max 1760 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 7718.00 ave 7718 max 7718 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 7718 Ave neighs/atom = 1.5439088 Neighbor list builds = 20 Dangerous builds = 20 unfix benchmark variable end_time equal time() # 记录结束时间 variable time_run equal v_end_time - v_start_time # 正确写法:使用变量名而非${} ERROR: Illegal variable command (src/variable.cpp:410) Last command: variable time_run equal v_end_time - v_start_time # 正确写法:使用变量名而非${}
07-11
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