0592. Fraction Addition and Subtraction
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https://leetcode.com/problems/fraction-addition-and-subtraction
Given a string expression
representing an expression of fraction addition and subtraction, return the calculation result in string format.
The final result should be an . If your final result is an integer, say 2
, you need to change it to the format of a fraction that has a denominator 1
. So in this case, 2
should be converted to 2/1
.
Example 1:
Example 2:
Example 3:
Example 4:
Constraints:
The input string only contains '0'
to '9'
, '/'
, '+'
and '-'
. So does the output.
Each fraction (input and output) has the format ±numerator/denominator
. If the first input fraction or the output is positive, then '+'
will be omitted.
The input only contains valid irreducible fractions, where the numerator and denominator of each fraction will always be in the range [1, 10]
. If the denominator is 1
, it means this fraction is actually an integer in a fraction format defined above.
The number of given fractions will be in the range [1, 10]
.
The numerator and denominator of the final result are guaranteed to be valid and in the range of 32-bit int.