2020牛客暑期多校训练营（第三场）E——Two Matchings

2020牛客暑期多校训练营（第三场）E——Two Matchings 题目描述 输入描述 The first line contains one integer t (1≤t≤5×10^4) --- the number of test cases. Each test contains two lines. The first line contains one integer n (n≥4n

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