Magic Box

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You are given a Box pack of N magic String . Danny is quite eager to find out what is in the box so he start taking out string one by one and adding them to his backpack . but danny dont like to keep duplicate items . so if he finds that the string is already in his bag he throws it away ! calculate the weight of danny's backpack considering that each string weights 1 g . ###Input: -

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solution.cppC++17

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