LihuaWu

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <errno.h>

LihuaWu

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

LihuaWu

#include <utility>
#include <iostream>

int main() {
  int a = 5;
    int&& b = std::move(a);  //我觉得5-6行本就不应该编译过，b的类型是右值引用，但是b出现在表达式的左边，因此是个左值。这是为啥呢？
    b++; 
    std::cout << "a is : " << a << "\n";
  return 0;
}

LihuaWu

#include <iostream>
#include <utility>
#include <memory>

using namespace std;

int main() {

        std::unique_ptr<int> upi(new int(5));

LihuaWu

//
// Simple and fast atof (ascii to float) function.
//
// - Executes about 5x faster than standard MSCRT library atof().
// - An attractive alternative if the number of calls is in the millions.
// - Assumes input is a proper integer, fraction, or scientific format.
// - Matches library atof() to 15 digits (except at extreme exponents).
// - Follows atof() precedent of essentially no error checking.
//
// 09-May-2009 Tom Van Baak (tvb) www.LeapSecond.com

LihuaWu

#include <stdio.h>

#include <functional>
#include <iostream>

using namespace std;

namespace UseConstAndNonConstLvalueRef {
void F(int&& a) {
        printf("rvalue ref: %d\n", a);

LihuaWu

#include <stdio.h>

#include <vector>
#include <algorithm>
#include <functional>
#include <string>
#include <queue>
#include <memory>
#include <utility>

LihuaWu

#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <iterator>

using namespace std;

int abs(int x) {
        return x > 0 ? x : -x;