oc中排序的总结
2015-11-19 00:03 真实16 阅读(202) 评论(0) 编辑 收藏 举报/*******************************快速排序 start**********************************/
//随即取 当前取第一个，首先找到第一个的位置，然后分成left和right两组子集 ，分别对left和right继续执行分割(同上操作)
-(void)QuickSort:(NSMutableArray *)list StartIndex:(NSInteger)startIndex EndIndex:(NSInteger)endIndex{
if(startIndex >= endIndex)return;
NSNumber * temp = [list objectAtIndex:startIndex];
NSInteger tempIndex = startIndex; //临时索引 处理交换位置(即下一个交换的对象的位置)
for(int i = startIndex + 1 ; i <= endIndex ; i++){
NSNumber *t = [list objectAtIndex:i];
if([temp intValue] > [t intValue]){
tempIndex = tempIndex + 1;
[list exchangeObjectAtIndex:tempIndex withObjectAtIndex:i];
}
}
[list exchangeObjectAtIndex:tempIndex withObjectAtIndex:startIndex];
[self QuickSort:list StartIndex:startIndex EndIndex:tempIndex-1];
[self QuickSort:list StartIndex:tempIndex+1 EndIndex:endIndex];
}
/*******************************快速排序 end**********************************/
/*******************************冒泡排序 start**********************************/
//取第一个 与其邻接的对比，若大则交换
-(void)BubbleSort:(NSMutableArray *)list{
for (int j = 1; j<= [list count]; j++) {
for(int i = 0 ;i < j ; i++){
if(i == [list count]-1)return;
NSInteger a1 = [[list objectAtIndex:i] intValue];
NSInteger a2 = [[list objectAtIndex:i+1] intValue];
if(a1 > a2){
[list exchangeObjectAtIndex:i withObjectAtIndex:i+1];
}
}
}
}
/*******************************冒泡排序 end**********************************/
/*******************************直接插入排序 start**********************************/
//从无序表中取出第一个元素，插入到有序表的合适位置，使有序表仍然有序
-(void)InsertSort:(NSMutableArray *)list{
for(int i = 1 ; i < [list count] ; i++){
int j = i;
NSInteger temp= [[list objectAtIndex:i] intValue];
while (j > 0 && temp < [[list objectAtIndex:j - 1]intValue]) {
[list replaceObjectAtIndex:j withObject:[list objectAtIndex:(j-1)]];
//list[j] = list[j-1];
j--;
}
[list replaceObjectAtIndex:j withObject:[NSNumber numberWithInt:temp]];
//list[j] = temp;
}
}
/*******************************直接插入排序 end**********************************/
/*******************************折半插入排序 start**********************************/
//从无序表中取出第一个元素，利用折半查找插入到有序表的合适位置，使有序表仍然有序
-(void)BinaryInsertSort:(NSMutableArray *)list{
//索引从1开始 默认让出第一元素为默认有序表 从第二个元素开始比较
for(int i = 1 ; i < [list count] ; i++){
//binary search start
NSInteger temp= [[list objectAtIndex:i] intValue];
int left = 0;
int right = i - 1;
while (left <= right) {
int middle = (left + right)/2;
if(temp < [[list objectAtIndex:middle] intValue]){
right = middle - 1;
}else{
left = middle + 1;
}
}
//binary search end
//移动3,5,6,[4] 4是当前目标对象 利用binarysearch 找到4应该在有续集{3,5,6}的位置，然后向后移动即{3,5,6,[4]}-->{3,[4],5,6}
for(int j = i ; j > left; j--){
[list replaceObjectAtIndex:j withObject:[list objectAtIndex:j-1]];
}
[list replaceObjectAtIndex:left withObject:[NSNumber numberWithInt:temp]];
}
}
/*******************************折半插入排序 end**********************************/
/*******************************希尔排序 start**********************************/
//对直接插入排序优化，创造一个gap 来对表进行分割，对分割后的每个子集进行直接插入排序 知道gap＝＝1结束
-(void)shellSort:(NSMutableArray *)list{
int gap = [list count] / 2;
while (gap >= 1) {
for(int i = gap ; i < [list count]; i++){
NSInteger temp = [[list objectAtIndex:i] intValue];
int j = i;
while (j >= gap && temp < [[list objectAtIndex:(j - gap)] intValue]) {
[list replaceObjectAtIndex:j withObject:[list objectAtIndex:j-gap]];
j -= gap;
}
[list replaceObjectAtIndex:j withObject:[NSNumber numberWithInt:temp]];
}
gap = gap / 2;
}
}
/*******************************希尔排序 end**********************************/
/*******************************堆排序 start**********************************/
//创建最大堆heap 最大／最小优先级队列
-(void)CreateBiggestHeap:(NSMutableArray *)list Count:(NSInteger)count{
//int count = [list count];
int lastParentIndex = (count - 2)/2;
for(int i = lastParentIndex; i >= 0 ; i--){
NSInteger parentIndex = i;
NSInteger parentNode = [[list objectAtIndex:parentIndex] intValue];
//获取左子结点为当前子结点
int currentChildIndex = 2*i + 1;
//
while (currentChildIndex <= count - 1) {
NSInteger leftChildNode = [[list objectAtIndex:(currentChildIndex)] intValue];
if((currentChildIndex + 1) <= count-1){//表示存在右子结点
//读取右子结点
int rightChildIndex =currentChildIndex + 1;
NSInteger rightChildNode = [[list objectAtIndex:(rightChildIndex)] intValue];
//如果右子结点为最大
if(rightChildNode > leftChildNode && rightChildNode > parentNode){
[list exchangeObjectAtIndex:parentIndex withObjectAtIndex:rightChildIndex];
currentChildIndex = rightChildIndex;//右子结点为当前子结点 继续循环
//左子结点最大
}else if(leftChildNode > rightChildNode && leftChildNode > parentNode){
[list exchangeObjectAtIndex:parentIndex withObjectAtIndex:currentChildIndex];
}
}else{
if(leftChildNode > parentNode){
[list exchangeObjectAtIndex:parentIndex withObjectAtIndex:currentChildIndex];
}
}
//更新父结点和下一个子结点
parentIndex = currentChildIndex;
currentChildIndex = 2*currentChildIndex + 1;
}
}
}
//每次执行最大堆(索引要前移动 即排除已经排好的最大堆头元算 交换到list尾部的这个元素)
-(void)HeapSort:(NSMutableArray *)list{
for(int i = [list count] ; i > 0; i--){
[self CreateBiggestHeap:list Count:i];
//NSLog(@"%@",list);
[list exchangeObjectAtIndex:(i-1) withObjectAtIndex:0];
}
}
/*******************************堆排序 end**********************************/
/*******************************直接选择排序 start**********************************/
//在对象集中选出最小的 若不是第一个 则与第一个交换 在剩余的对象集中选出最小的 执行前面的步骤
-(void)SelectSort:(NSMutableArray *)list{
for(int i = 0 ; i<[list count]; i++){
int k = i;
for(int j = i+1 ; j<[list count]; j++){
NSInteger jvalue = [[list objectAtIndex:j] intValue];
NSInteger kvalue = [[list objectAtIndex:k] intValue];
if(jvalue < kvalue){
k = j;
}
}
if(k != i){
[list exchangeObjectAtIndex:i withObjectAtIndex:k];
}
}
}
/*******************************直接选择排序 end**********************************/
