iOS算法

1、苹果，橘子，葡萄，每种水果在2-5s随机时间内，随机生成8-20的价格，然后对价格进行排序

{
    NSMutalbeDictionary *dictionary = [NSMutalbeDictionary dictionary];
    void (^reArrange)(void) = ^{
        NSMutableArray*array = [NSMutableArray array];
        for (NSString *key in self.dictionary.allKeys) {
            [array addObject:@{key: self.dictionary[key]}];
        }
        NSArray *sortArr = [array sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
            NSDictionary *dic1 = obj1;
            NSDictionary *dic2 = obj2;
            if ([dic1.allValues.firstObject intValue] > [dic2.allValues.firstObject intValue]) {
                return NSOrderedDescending;
            } else {
                return NSOrderedAscending;
            }
        }];
        for (NSDictionary *dic in sortArr) {
            printf("%s:%s,", [dic.allKeys.firstObject UTF8String], [[NSString stringWithFormat:@"%@", dic.allValues.firstObject]UTF8String]);
        }
        printf("\n");
    };
    
    
    dispatch_queue_t asyncqueue = dispatch_queue_create("com.aa.aa.aa", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(asyncqueue, ^{
        int time = arc4random() % 6 + 1;
        NSTimer *timer = [NSTimer timerWithTimeInterval:time repeats:YES block:^(NSTimer * _Nonnull timer) {
            @synchronized (self) {
                size_t price = arc4random() % 4 + 8;
                [self.dictionary setObject:@(price) forKey:@"apple"];
                reArrange();
                NSLog(@"---------------------apple---------------------");
            }
        }];
        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
        [[NSRunLoop currentRunLoop] run];
    });
    dispatch_async(asyncqueue, ^{
        int time = arc4random() % 6 + 1;
        NSTimer *timer = [NSTimer timerWithTimeInterval:time repeats:YES block:^(NSTimer * _Nonnull timer) {
            @synchronized (self) {
                size_t price = arc4random() % 4 + 8;
                [self.dictionary setObject:@(price) forKey:@"orange"];
                reArrange();
                NSLog(@"---------------------orange---------------------");
            }
        }];
        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
        [[NSRunLoop currentRunLoop] run];
    });
    dispatch_async(asyncqueue, ^{
        int time = arc4random() % 6 + 1;
        NSTimer *timer = [NSTimer timerWithTimeInterval:time repeats:YES block:^(NSTimer * _Nonnull timer) {
            @synchronized (self) {
                size_t price = arc4random() % 4 + 8;
                [self.dictionary setObject:@(price) forKey:@"grape"];
                reArrange();
                NSLog(@"---------------------grape---------------------");
            }
        }];
        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
        [[NSRunLoop currentRunLoop] run];
    });
}