[LeetCode 170] Two Sum III - Data structure design
Design and implement a TwoSum class. It should support the following operations: add and find.
add - Add the number to an internal data structure. find - Find if there exists any pair of numbers which sum is equal to the value.
For example,
add(1);
add(3);
add(5);
find(4) -> true
find(7) -> false
DiffcultyEasy
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