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囧，表示这题蛋疼之处在于领跑的牛必须在整数时间退场……rt 虽然任意时间牛跑没力气了都可以走，但是领跑的牛在非整数分钟走了以后不能换新的，所以领跑的牛必须在整数分钟把自己的力气花完，因此需要DP出来，不能直接简单的用平方根算 Followed by: Post your reply here: |
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