二分法: NSObject-(NSInteger) binarySearchIndex:(NSNumber *)key arrayBySearch:(NSMutableArray *) array;@implementation binarySearch-(NSInteger) binarySearchIndex:(NSNumber *)key arrayBySearch:(NSMutableArray *) array{NSInteger min = 0;NSInteger max = (NSInteger)([array count]-1);while (min <= max) {NSInteger mid = (min+max)/2;if (key > [array objectAtIndex:mid]) {min = mid + 1;}else if (key < [array objectAtIndex:mid]){max = mid – 1;}else if(key == [array objectAtIndex:mid]){return mid;}}return -1;}@end- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.NSMutableArray *test = [[NSMutableArray alloc] init];for (int i=0; i<20; i=i+2) {[test addObject:[NSNumber numberWithInteger:i]];}binarySearch *myBinarysearch = [[binarySearch alloc] init];NSInteger getInt = [myBinarysearch binarySearchIndex:[NSNumber numberWithInteger:100] arrayBySearch:test];NSLog(@”%ld”, (long)getInt); }冒泡排序: NSObject-(NSMutableArray *)bubbleSort:(NSMutableArray *)array;@implementation bubble-(NSMutableArray *)bubbleSort:(NSMutableArray *)array{for (int j=0; j<array.count; j++) {for (int i=0; i<array.count-j-1; i++) {if (i == [array count]-1) {return array;}NSInteger pre = [[array objectAtIndex:i] intValue];NSInteger beh = [[array objectAtIndex:i+1] intValue];if (pre >beh) {[array exchangeObjectAtIndex:i withObjectAtIndex:i+1];}}}return array;}@end快速排序//快速排序-(void)quickSort:(NSMutableArray *)_dataSource startIndex:(NSInteger)start endIndex:(NSInteger)end{if (start<end) {NSInteger standardValue=[_dataSource[start] intValue];NSInteger left=start,right=end;while (start<end) {//从后往前找，如果后面的数值大于基准值，递减while (start<end&&[_dataSource[end] intValue]>standardValue) {end–;}//小于基准值的时候，给数组中索引为start赋值if (start<end) {_dataSource[start]=_dataSource[end];start=start+1;}//从前往后找，如果数值小于基准值，递增while (start<end&&[_dataSource[start] intValue]<standardValue) {start++;}//大于基准值，给数组中索引为end的数据赋值if (start<end) {_dataSource[end]=_dataSource[start];end=end-1;}}//退出的时候值start和end相等_dataSource[start]=[NSString stringWithFormat:@”%ld”,(long)standardValue];[self quickSort:_dataSource startIndex:left endIndex:end-1];//处理左边[self quickSort:_dataSource startIndex:end+1 endIndex:right];//处理右边}}
，与其在那里苦苦挣扎，碍于面子硬撑，倒不如微笑着面对，
