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No need to count, there are 21 people in total;
The appearance of the entire list has been lowered by half a street due to this problem of the original poster;

The double type can only store 14 to 15 significant figures, and the excess can only be rounded (five is rounded according to certain rules)

Integers (without decimal point or exponent notation) can be up to 15 digits.
Save the two strings as an array
Add and subtract one bit one by one, subtract 1 for the next bit of a negative number
Then concatenate the arrays

. . . . . . . . . .
FAQ.
http://ecma-international.org...
Hope it can help you