time-river

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

'''
a simple program which could print all package of content sended from local machine
prepare:
    # ip tuntap add mode tun tun0
    # ip link set tun0 up
    # ip addr add 10.0.0.2/24 dev tun0
    # ip route add default via 10.0.0.2 dev tun0 table 100

time-river

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

'''
description:
    like 'simple-tun-read-write.py', but automatic configure tun device and route table.
    catch all ip packet and print
        'IP protocol version + IP header size'
        'protocol of encapsulated packet'
        'source IP'

time-river

/*
 * 背包九讲之01背包 滚动数组
 *  from: http://www.hawstein.com/posts/dp-knapsack.html
 */

#include <bits/stdc++.h>

using namespace std;

#define MAXN 1000

time-river

/*
 * 背包九讲之01背包 二维数组
 *  from: http://www.hawstein.com/posts/dp-knapsack.html
 */

#include <bits/stdc++.h>

using namespace std;

#define MAXN 1000

time-river

/*
 * 背包九讲之完全背包 恰好装满 二维数组
 *  from: http://acm.hdu.edu.cn/showproblem.php?pid=1114
 *  reference: https://blog.csdn.net/liujc_/article/details/44003167
 */
#include <bits/stdc++.h>

#define NMAX 500
#define PMAX 1000000001

time-river

/*
 * 背包九讲之完全背包 恰好装满 滚动数组
 *  from: http://acm.hdu.edu.cn/showproblem.php?pid=1114
 * reference: https://blog.csdn.net/liujc_/article/details/44003167
 */

#include <bits/stdc++.h>

#define PMAX 1000000001

time-river

/*
 * 背包九讲之多重背包 二维数组
 *  from: http://acm.hdu.edu.cn/showproblem.php?pid=2191
 *  reference: https://blog.csdn.net/hellobabygogo3/article/details/7993547
 */

#include <bits/stdc++.h>

using namespace std;

time-river

/*
 * 背包九讲之多重背包 一维数组
 *  from: http://acm.hdu.edu.cn/showproblem.php?pid=2191
 *  reference: https://blog.csdn.net/hellobabygogo3/article/details/7993547
 */

#include <bits/stdc++.h>

using namespace std;

time-river

'''
link
 - https://leetcode.com/problems/permutations/

problem:
    Given a collection of distinct integers, return all possible permutations.
    Example:
        Input: [1,2,3]
        Output:
        [

time-river

/**
 * strncat test
 * build: gcc -o strncpy strncpy.c  -lcrypto
 * output:
 *  $ ./strncpy 
 *  time: 1569841068 sha256(long): H8Zw/CnxF9d/kG10Ck7VfDMNqWADDGMsrD7Wx0wTshY=
 *  sha256(short): H8Zw/CnxF9d/
 *  time: 1569841069 sha256(long): uyzMNURXeyOjyCZ1ANI6Lze6lwF1bKUPjU3rHBZyTNY=
 *  sha256(short): H8Zw/CnxF9d/uyzMNURXeyOj
 *  time: 1569841070 sha256(long): 1zdqJgOCuILZkti92I2YUuT/KGNuqmSPOioA8rjxEeg=