MagSafe wireless charging up to 25W
AI is far from reaching its theoretical capability: actual coverage remains a fraction of what's feasible
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implies a_i=0 \quad \forall i. Recall that l_i(x) is 1
示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。
Cristiano Amon, Qualcomm’s chief executive