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原创 C++选择排序法(Selection Sort)

// implementation of Selection Sort (C++)#include <iostream>using namespace std;void SwapTwo(int& a, int& b){ int temp=a; a=b; b=temp;}void SelectionSort(int arr[], int size){ for (int i=0; i<size;i++) { int Smalle

2014-04-04 17:37:25 4179

原创 C++插入排序法(Insertion Sort)

// implementation of Insertion Sort (C++)#include <iostream>using namespace std;void SwapTwo(int &a, int &b){ int temp = a; a = b; b = temp;}void InsertSort(int arr[], int size){ for (int i=1; i<size; i++) { int inser

2014-04-03 23:38:52 3026

原创 C---read directory

#include #include #include #include #include #include #include #include int main(){DIR *dir;struct dirent *dit;dir=opendir("new");if (dir==NULL){printf("the folder does not exist\n");

2012-06-11 18:04:39 1200 1

原创 c++求两数 GCD

#include using namespace std;int GCD(int num1, int num2){ int mod=0; if ((mod = (num1%num2)) !=0) { return GCD(num2, mod); } else { return num2; }}int main(){ int num1, num2; cou

2012-05-12 19:58:33 1746 1

转载 RC4

RC4算法：1. 简述：该算法以OFB方式工作：密匙序列和明文相互独立。它有一个8*8的S盒：S0,S1,S2,....,S255。所有项都是数字 0到255的置换，并且这个置换是一个可变长度密匙的函数。 2. 加密过程： 1>初始化S盒：首先进行线性填充：

2012-05-12 13:33:21 509

原创 Playfair Cipher

Playfair Cipher 属于Block cipher的一种。其block size是两个字母大小，选取一个单词座位key，无重复字母，然后填写于5*5的方格中，剩下字母依次填入：两个字母X1和X2被加密为Y1和Y2的法则是：1. 如果X1和X2在同一横行，那么Y1和Y2分别问X1和X2右边的字母。（到末端循环从头开始）2. 如果X1和X2在同一竖列，那么Y1

2012-05-05 21:51:13 1619

原创 C++ 堆排序 (HeapSort)

// HeapSort/******************************************** aim: to sort an array in ascending order. 1. making a max-heap firstly(biggest on top). using siftup function (siftdown works as well if you

2012-03-15 17:58:27 2645

原创二叉搜索(Binary Search)

// Binary Search#include using namespace std;void SwapTwo(int &a, int &b){ int temp = a; a = b; b= temp;}void SortNums(int nums[], int size){ for (int i=1; i<size; i++) { int j=i;

2012-03-13 16:31:48 529

原创选择排序法 (Selection Sort)

// Selection Sort#include using namespace std;void SwapTwo(int &a, int &b){ int temp = a; a=b; b=temp;}int FindSIndex(int nums[], int start, int size){ int smallest = nums[start]; int

2012-03-13 15:13:45 477

原创 Recursive Fibonacci

/* Recursive Fibonacci*/#include using namespace std;int fib(int n){ int f0=0, f1=1; int num; if (n<2) return n; else { return fib(n-1)+fib(n-2); } }int main(){ int n; cout

2012-03-04 16:03:17 541

原创 C++冒泡排序法 (Bubble Sort)

// implementation of Bubble Sort (C++)#include <iostream>using namespace std;void SwapTwo(int &a, int &b){ int temp = a; a = b; b = temp;}void BubbleSort(int arr[], int size){ for (int i=0; i<size; i++) { int j = size

2012-02-29 14:14:36 834