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Because the quesyion was weird asked: you mus change 1 element from B. So in the case A is the same as B, we need minus 1 from the pairs.
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Beautiful Pairs
You are viewing a single comment's thread. Return to all comments →
Because the quesyion was weird asked: you mus change 1 element from B. So in the case A is the same as B, we need minus 1 from the pairs.