2 has an array with 13 elements in the array, first grouping the array, each of the 3 elements as a group, divided into groups, and finally using an array to manage these groupings uniformly. (To create an array dynamically).

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2. Nsmutablearray *arr = [[Nsmutablearray alloc] init];
4. For (int i = 0; i < i++) {
6. [Arr addobject:[nsstring stringwithformat:@"damo%d", I]];
8. }
10. NSLog (@"%@", arr);
12. Nsmutablearray *bigarr = [[Nsmutablearray alloc] initwithcapacity:1];
14. Nsmutablearray *smallarr = nil;
16. For (int i = 0; i < [arr count]; i++) {
18. if (i% 3 = = 0) {
20. //Just read 0 3 6 9 12 to open up space to store the next three elements
22. Smallarr = [[Nsmutablearray alloc] initwithcapacity:1];
24. //Add a decimal group to a large array for management
26. [Bigarr Addobject:smallarr];
28. }
30. [Smallarr Addobject:[arr objectatindex:i];
32. }
34. NSLog (@"%@", Bigarr);</span>

2 has an array with 13 elements in the array, first grouping the array, each of the 3 elements as a group, divided into groups, and finally using an array to manage these groupings uniformly. (To create an array dynamically).