CF452E Three strings

You are given three strings $ (s_{1},s_{2},s_{3}) $ . For each integer $ l $ $ (1

N/A

N/A

Consider a string $ t=t_{1}t_{2}...\ t_{|t|} $ , where $ t_{i} $ denotes the $ i $ -th character of the string, and $ |t| $ denotes the length of the string. Then $ t[i...\ j] $ $ (1