vigack

int x, y;
bool f = ((x^y)<0);		// true表示两数符号相反

vigack

Node* insert(Node *head,int data)
{
    Node *tail;
    Node *tmp;
    tail = (Node *)malloc(sizeof(struct Node));
    tail->data = data;
    if(head == NULL){
        head = tail;
    }else{
        tmp = head;

vigack

/*  基本的实现思路：维护一个Queue，push根节点。当Queue非空，开始循环，POP->取值->PUSH LEFT节点->PUSH RIGHT节点 */

vigack

int gcd(int a, int b){
    int rmd;  // remainder
    if(a<b)    // insure a>b
        return gcd(b,a);
    while((rmd=a%b)!=0){
        a = b;
        b = rmd;
    }   // loop down, b is the gcd
    return b;
}

vigack

void swap(int *a, int *b){
    int tmp;
    tmp = *a;
    *a = *b;
    *b = tmp;
}

void quickSort(int left, int right, int *arr){
    // base
    if(left>=right)

vigack

require 'oci8'

conn = OCI8.new('username', 'password', 'host:port/service')
table = conn.describe_table('tableName')
table.columns

vigack

private Table getTable(String scheme, String tableName){
        Connection connection = null;
        Table table = new Table();
        table.setTableName(tableName);
        try {
            List<Column> columns = new ArrayList<>();
            connection = getConnection(scheme);
            ResultSet resultSet =
                    connection.getMetaData().getColumns(null, null,tableName,null);
            while(resultSet.next()){

vigack

# 原型，打印出所有ip，但是会重复，且ip之间没有换行
perl -ne 'print $1 if(/Failed password.+(\d+.\d+.\d+.\d+)/)' /var/log/secure*

# 发现上面那个命令没有打印全ip，改为下面的，这样就会获得完整ip并且ip之间换行了
perl -ne 'print "$1\n" if(/Failed password\D+(\d+\.\d+\.\d+\.\d+)/)' /var/log/secure*

# 使用{3}来缩减代码量
perl -ne 'print "$1\n" if(/Failed password\D+((\d+\.){3}\d+)/)' /var/log/secure*

# 去重，这个感觉比较麻烦，因为如果用数组或者哈希的话，就不能用-n来去掉外面那层while(<>){...}了

vigack

初次尝试REST规范，在使用PATCH，PUT的时候出现了问题，无法通过@RequestParam获取参数值 阅读源码，发现对于multipart/formdata形式的请求，spring都会做如下判断

public static final boolean isMultipartContent(
            HttpServletRequest request) {
        if (!POST_METHOD.equalsIgnoreCase(request.getMethod())) {
            return false;
        }
 return FileUploadBase.isMultipartContent(new ServletRequestContext(request));

vigack

public class ProxyDemo {
    @Test
    public void test() throws IOException {
        // 如果是http代理
        //System.setProperty("http.proxyHost", sProxyHost);  
        //System.setProperty("http.proxyPort", sProxyPort)  
        System.setProperty("socksProxyHost", "127.0.0.1");
        System.setProperty("socksProxyPort", "1080");

        OkHttpClient client = new OkHttpClient();