#在OC中實現(xiàn)常用的算法(冒泡,選擇,快速,插入)
## 1.冒泡排序
- (void)viewDidLoad {
[super viewDidLoad];
//OC中常用的一些排序
NSArray *arr = @[@"1",@"2",@"5",@"3",@"6",@"9",@"5",];
NSMutableArray *oldArr = [NSMutableArray arrayWithArray:arr];
NSLog(@"%@",oldArr);
[self bubbleSort:oldArr];
[self selectionSort:oldArr];
[self insertSor:oldArr];
[self quickSort:oldArr leftIndex:1 rightIndex:5];
}
#pragma mark - bubbleSort
/**
①.冒泡排序算法
@param array參數(shù)
*/
- (void)bubbleSort:(NSMutableArray *)array {
for (int i = 0; i < array.count; i++) {
for (int j = 0; j < array.count-i-1; j++) {
if ([array[j+1]integerValue] < [array[j]integerValue]) {
int temp = [array[j] integerValue];
array[j] = array[j+1];
array[j+1] = [NSNumber numberWithInt:temp];
? ? ? ? ? ? ? ? ? ? }
? ? ? ? ? ? } ?
? ? }
NSLog(@"冒泡排序后: %@",array);
}
#pragma mark - selectionSort
/**
②.選擇排序
@param array參數(shù)
*/
- (void)selectionSort:(NSMutableArray *)array {
for (int i = 0; i < array.count; i++) {
for (int j = i+1; j
if ([array[i]integerValue] > [array[j]integerValue]) {
int temp = [array[i] integerValue];
array[i] = array[j];
array[j] = [NSNumber numberWithInt:temp];
? ? ? ? ? ? ? ? }
? ? ? ? ? }
? }
NSLog(@"選擇排序后: %@",array);
}
#pragma mark - insertSort
/**
③.插入排序
@param array參數(shù)
*/
- (void)insertSor:(NSMutableArray *)array {
for (int i = 1; i < array.count; i++) {
int temp = [array[i]integerValue];
for (int j = i-1; j>=0 && temp <[array[j] integerValue]; j--) {
array[j+1] = array[j];
array[j] = [NSNumber numberWithInt:temp];
? ? ? ? ? ? ?}
? ? ?}
NSLog(@"插入排序后: %@",array);
}
#pragma mark - quickSort
/**
④.快速排序
@param array參數(shù)
*/
- (void)quickSort:(NSMutableArray *)array leftIndex:(int)left rightIndex:(int)right {
if (left < right) {
int temp = [self getMiddleIndex:array leftIndex:left rightIndex:right];
[self quickSort:array leftIndex:left rightIndex:temp-1];
[self quickSort:array leftIndex:temp+1 rightIndex:right];
? ? }
NSLog(@"快速排序后: %@",array);
}
- (int)getMiddleIndex:(NSMutableArray *)array leftIndex:(int)left rightIndex:(int)right {
int tempValue = [array[left] integerValue];
while (left < right) {
while (left < right && tempValue <= [array[right] integerValue]) {
right--;
? ? }
if (left < right) {
array[left]=array[right];
? ?}
while (left < right && [array[left] integerValue] <= tempValue) {
left++;
? ?}
if (left < right) {
array[left] = array[right];
? ?}
? ?}
array[left] = [NSNumber numberWithInt:tempValue];
return left;
}
@end
