[C++]数据结构-排序：插入排序之直接插入排序

得赶紧休息了，木有时间写原理了。直接上代码。

/* <插入排序-直接插入排序> */
#include<iostream>
using namespace std;

void print(int *nodes, int length){
	for(int i=0;i<length;i++){ //notice: No equal sign in middle condition, otherwise the last node will be error
		printf("%d\t", nodes[i]);
	}
	printf("\n");
}

void InsertSort(int *nodes,int length){
	for(int i=2;i<length;i++){
		if(nodes[i] < nodes[i-1]){//default:ascending order 
			nodes[0] = nodes[i]; //set nodes[0] as a sentry or flag
			int j;
			for(j=i-1;nodes[0] < nodes[j];j--){
				nodes[j+1] = nodes[j];
			}
			nodes[j+1] = nodes[0];
		}
	}
}

/*  直接插入排序(Insertion Sorting)
	[1] init thought:
	foreach:nodes[2...n] as nodes(i)
		set 哨兵nodes(0) = nodes(i);
		foreach:nodes[i-1...n] as nodes(j)
			if nodes(j).key <= nodes(0).key
				nodes(j+1) = nodes(j);
			else
				break;
		nodes[j+1] = nodes[0];	
*/
int main(){
	int nodes[11] = {0,1,3,64,5,57,33,32,53,7509,6578};	
	
	print(nodes,11);
	InsertSort(nodes,11);
	print(nodes,11);
	
	return 0;
} 

output