luk6xff

You might want to read this to get an introduction to armel vs armhf.

If the below is too much, you can try Ubuntu-ARMv7-Qemu but note it contains non-free blobs.

Running ARM programs under linux (without starting QEMU VM!)

First, cross-compile user programs with GCC-ARM toolchain. Then install qemu-arm-static so that you can run ARM executables directly on linux

If there's no qemu-arm-static in the package list, install qemu-user-static instead

scottt

/* x86-64 program to test wether stack access without setting the stack poitner register would cause SEGFAULTs
 * $ ./stack-and-sp          # just access stack adjacent memory until SEGFAULT. 
 * $ ./stack-and-sp --set-sp # set stack pointer register before accessing memory.
 *
 * Output:
 * stack-and-sp: do_set_sp: 1
 * RLIMIT_STACK: 8192/unlimited (cur/max)
 * sp0: 0x7ffd5fdd3000
 * sp: 0x7ffd5f5d7000, size: 8176K
 */

jdh747

Concurrency Patterns in Go

Notes taken from Rob Pike's presentation 'Google I/O 2012 - Go Concurrency Patterns'.

1. Generator: function that returns a channel

The code is as follows:

c := boring("boring!")  // function returning a channel

for i := 0; i < 5; i++ {

APTy

# This file includes example usage and tests for the 'run-with-cleanup' call-able function.

.PHONY: test test-success test-failure main cleanup

-include cleanup.mk

test:
    test.sh

main:

yssharma

package main

/* Al useful imports */
import (
    "flag"
    "fmt"
    "net"
    "strings"
    "strconv"
    "time"

kanetai

def lowerBound(a, key)
    lb = -1; ub = a.length
    while ub - lb > 1
        mid = (lb + ub) / 2
        if a[mid] >= key
            ub = mid
        else
            lb = mid
        end
    end

ajhsu

// 1. 打開 Slack 網頁版
// 2. 開啟需要備份的對話視窗，包含 Direct Message 或 Channel 都可以
// 3. 打開 Chrome Dev Tools 的 Console
// 4. 複製貼上以下程式碼
// 5. 執行 JS 並輸出歷史訊息
// 6. 換下一個 Channel 繼續備份
// 7. 重複第4個步驟
// PS. 輸出到 Console 的歷史訊息，可以透過在空白處按右鍵 -> Save as ，另存成文字檔

var historyMessages = `[Slack Export History Messages] SEHM\n`;

heathermiller

This cheat sheet originated from the forum, credits to Laurent Poulain. We copied it and changed or added a few things.

Evaluation Rules

• Call by value: evaluates the function arguments before calling the function
• Call by name: evaluates the function first, and then evaluates the arguments if need be

    def example = 2      // evaluated when called
    val example = 2      // evaluated immediately

joepie91

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

• A Russian translation of this article can be found here, contributed by Timur Demin.
• A Turkish translation can be found here, contributed by agyild.
• There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

amoshyc

二分搜：講解

以下出現 A[l, r] 代表 A 陣列中 [l, r] 這個區間。 同理 A[l, r) 代表 A 陣列中 [l, r) 這個區間。

以下範例皆不處理 IO 的部份，都假設變數皆已被讀入。

基本使用

大一時學過，我們可以用二分搜在一個單調（遞增或遞減）的陣列中，尋找某個值在哪裡：