HBC252833简单数论Brilliant Idea题解

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One day, a brilliant idea came to Colin's mind.Given a string SSS with length nnn consisting of lowercase letters.Let SiS_iSi denotes the character of SSS with index iii , e.g. let S=S=S=abcthen S0=S_0=S0=a and S1=S_1=S1=b.Let S[l:r]S[l:r]S[l:r] denotes the substring of SSS with index form lll to rrr , e.g. let S=S=S=abc then S[1:2]=S[1:2]=S[1:2]=bc .Now we play a game on the string. You want to take as many turns successfully as you can.first choose two integers l,rl,rl,r satisfying 0≤l

One day, a brilliant idea came to Colin's mind. Given a string SSS with length nnn (indexed from 000 to n−1n-1n−1 ) consisting of lowercase letters. Let SiS_iSi​ denotes the character of SSS with index iii , e.g. let S=S=S= abc then S0=S_0=S0​= a and S1=S_1=S1​= b. Let S[l:r]S[l:r]S[l:r] denotes the substring of SSS with index form lll to rrr , e.g. let S=S=S= abc then S[1:2]=S[1:2]=S[1:2]= bc . Now we play a game on the string. You want to take as many turns successfully as you can. In one turn, you should: first choose two integers l,rl,rl,r satisfying 0≤l0ans_S>0ansS​>0 and anssans_sanss​ is finite? 3. how many strings satisfy ansSans_SansS​ is infinite?

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