-(void)lowSort:(NSMutableArray *)dataSource singleLength:(NSInteger)len
{NSInteger  sourceCount=[dataSource count];NSInteger R=256;NSMutableArray  *tempArr=[[NSMutableArray alloc]initWithCapacity:1];for (NSInteger i=0; i<sourceCount; i++) {[tempArr addObject:[NSNull null]];}for (NSInteger d=len-1; d>=0; d--) {NSMutableArray  *count=[[NSMutableArray alloc]initWithCapacity:1];for (NSInteger i=0; i<R+1; i++) {[count addObject:[NSNumber numberWithInteger:0]];}//统计频率for (NSInteger i=0; i<sourceCount; i++) {NSString  *str=[dataSource objectAtIndex:i];NSInteger  charValue=[str characterAtIndex:d]-48;count[charValue+1]=[NSNumber numberWithInteger:[count[charValue+1] integerValue]+1];}for (NSInteger j=0; j<R; j++) {count[j+1]=[NSNumber numberWithInteger:[count[j] integerValue]+[count[j+1] integerValue]];}//将元素从上到下分类for (NSInteger m=0; m<sourceCount; m++) {NSString  *str=[dataSource objectAtIndex:m];NSInteger  charValue=[str characterAtIndex:d]-48;tempArr[[count[charValue] integerValue]]=dataSource[m];count[charValue]=[NSNumber numberWithInteger:[count[charValue] integerValue]+1];}//重新排序赋值for (NSInteger i=0; i<sourceCount; i++) {dataSource[i]=tempArr[i];}}
}

        LSD  *lsd=[[LSD alloc]init];NSMutableArray  *dataSource=[[NSMutableArray alloc]initWithObjects:@"12345",@"23456",@"78901",@"89764",@"12345",@"45678",@"89794",@"89754",@"64532",@"69784",nil];[lsd lowSort:dataSource singleLength:7];[dataSource enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {NSLog(@"%@",obj);}];NSLog(@"技术交流群:%@",@"228407086");NSLog(@"博客园-FlyElephant:http://www.cnblogs.com/xiaofeixiang");