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  // generate [0..n-1]
  auto seq = [](size_t n) -> std::vector<size_t> {
      std::vector<size_t> v(n);
      for (size_t i=0; i<n; ++i) v[i] = i;
      return v;
  };
  auto index = seq(n);

  // n * n distance matrix
  std::vector<D> dists(n * n);

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#include <stdlib.h>
#include <string>

namespace {
const char kBin2Hex[] = { "0123456789ABCDEF" };

char Hex2Bin(char ch) {
  switch(ch) {
    case '0': return 0;
    case '1': return 1;

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#!/bin/sh

single_instance() {
    LOCKFILE=$1
    [ -f $LOCKFILE ] && echo "Another instance is running." && exit 1
    trap "{ rm -f $LOCKFILE; exit 0; }" EXIT SIGTERM SIGINT
    touch $LOCKFILE
}

single_instance /tmp/fix_vpn.lck

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#!/bin/sh
# @(#) sync-to-picasa.sh  Time-stamp: <Julian Qian 2013-08-08 00:58:30>
# Copyright 2013 Julian Qian
# Author: Julian Qian <[email protected]>
# Version: $Id: sync-to-picasa.sh,v 0.1 2013-08-07 23:51:13 jqian Exp $
#

BACKUP_LIST=(
    /store1/Downloads/LuluPhotos/百度云同步盘/来自：iPhone
    /store1/Downloads/LuluPhotos/Backup

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#!/usr/bin/env python
# -*- coding: utf-8; tab-width: 4; -*-
# @(#) gen_route.py  Time-stamp: <Julian Qian 2013-06-30 11:32:45>
# Copyright 2013 Julian Qian
# Author: Julian Qian <[email protected]>
# Version: $Id: gen_route.py,v 0.1 2013-06-30 09:50:56 jqian Exp $
#

'''
这个脚本用来替代chrountes，一是chroutes生成的路由规则太多，二是所有的国外IP全部走VPN还是感觉资源浪费，心理不舒服，所以最理想的方式还是想翻哪个域名就翻哪个域名才是最合理的。不过该脚本很简陋，只是一次性找出当前待翻域名对应的IP，这些大网站为了负载均衡，很可能IP有变化，或者使用CDN，可能导致找不到被墙的IP，不过暂时看来还是凑合能用的。google, twitter没问题，其他的我也不咋上，没有仔细琢磨。如果发觉一段时间后再次被墙，就再运行一次该脚本重新生成路由即可。

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int main(int argc, char *argv[])

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#include <iostream>
#include <map>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>

enum { N = 10 };

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// -*- mode: c++ -*-
// @(#) test_bdb.cpp  Time-stamp: <Julian Qian 2013-05-07 11:37:26>
// Copyright 2013 Julian Qian
// Author: Julian Qian <[email protected]>
// Version: $Id: test_bdb.cpp,v 0.1 2013-05-02 20:58:38 jqian Exp $
//

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

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// -*- mode: c++ -*-
// @(#) test_secondary_db.cpp  Time-stamp: <Julian Qian 2013-03-23 22:16:12>
// Copyright 2013 Julian Qian
// Author: Julian Qian <[email protected]>
// Version: $Id: test_secondary_db.cpp,v 0.1 2013-03-23 21:31:19 jqian Exp $
//

// test multiple secondary index of berkeley db

// g++ -o test_secondary_db test_secondary_db.cpp -g -O2 -Wall -Wextra -ldb

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/* @(#)test_crc32.cpp
 * Time-stamp: < 2011-12-26 11:30:17>
 * Copyright 2011
 * Version: $Id: test_crc32.c,v 0.0 2011/12/26 03:25:28 jqian Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>