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A
B
C
D
Sum
Rank-
25
20
75
120
19/25乱序放题,被 T1 硬控了啊啊啊啊啊
A. 铁轨
原
B. 参加
看到区间操作想不到差分,设差分数组为 \(b\),那么要求即为 \(\forall i\in[1,k],b_i>0,\forall i\in[k+1,n],b_i<…