HBC214395Tabris减肥记,枚举StringCommutativity题解

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Bobo has n strings s1, ... , sn, and he would like to find the number of pairs i < j where si + sj = sj + si. Note that a + b means the concatenation of the string a and b, i.e., writing the string a first, and the string b second.

Bobo has n strings s1, ... , sn, and he would like to find the number of pairs i < j where si + sj = sj + si. Note that a + b means the concatenation of the string a and b, i.e., writing the string a first, and the string b second.

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标签： HBC214395Tabris减肥记 枚举StringCommutativity题解