BZOJ3295: [Cqoi2011]动态逆序对(带修主席树)
3295: [Cqoi2011]动态逆序对 **Time Limit: 10 Sec Memory Limit: 128 MB Description 对于序列A,它的逆序对数定义为满足i<ji<ji(1,5,3,4,2)(1,3,4,2)(3,4,2)(3,2)(3)(1,5,3,4,2)(1,3,4,2)(3,4,2)(3,2)(3)(1,5,3,4,2)...