ROME Cold Day--progressive

Chapter III

1. Operation of the set; 2. File operation;

3. Character encoding and decoding;

1. Collection

A collection is an unordered, non-repeating combination of data.

Purpose of the collection:

1. Go to the weight, after the list becomes a set, will automatically go to the weight

2. The relationship between the set, for example: the intersection of the set, the combination, the subset relationship, for the storage of data, operation has certain advantages

Go weight:

Go heavy

ROME Cold Day--progressive