2有一个数组,数组中有13个元素,先将该数组进行分组,每3个元素为一组,分为若干组,最后用一个数组统一管理这些分组.(要动态创建数组).

[cpp] view plaincopyprint?

NSMutableArray *arr = [[NSMutableArray alloc] init];
        for (int i = 0; i < 15 ; i++) {
            [arr addObject:[NSString stringWithFormat:@"damo%d",i]];
        }
        NSLog(@"%@",arr);
        NSMutableArray *bigArr =  [[NSMutableArray alloc] initWithCapacity:1];
        NSMutableArray *smallArr = nil;
        for (int i = 0; i < [arr count]; i++) {
                        if (i % 3 == 0) {
                //只要读到0 3 6 9 12 就开辟空间存储接下来的三个元素
                smallArr = [[NSMutableArray alloc] initWithCapacity:1];
                //将小数组添加到大数组中进行管理
                [bigArr addObject:smallArr];
            }
            [smallArr addObject:[arr objectAtIndex:i]];
        }
        NSLog(@"%@",bigArr);</span>