京东 11.11 红包
Codeforces Round #791 (Div. 2) vp
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来晚了，所以“12秒AK div4”？Codeforces Round #817 (Div. 4) 不算实况的实况：）
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Snippet23: 快速幂，O(logN)复杂度计算a的b次方