The role of the resize function is "suggestions collection"

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resize Function function ： Modify the number of valid characters

resize(n) If the number of valid characters increases , Then the new position is filled ‘\0’

resize(n,ch) If the number of valid characters increases , Then the new position is filled ch

If size Reduce , Here's the picture .

resize What changes is the number of effective elements , When adjusted size Greater than capacity , Capacity will change . reserve Modify capacity , Does not affect the size. clear Only the number of effective elements is affected size

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