#include using namespace std; using Int = long long; template inline void chmin(T1 &a,T2 b){if(a>b) a=b;} template inline void chmax(T1 &a,T2 b){if(a>s; Int n=s.size(); vector cnt(26,0); for(char c:s) cnt[c-'A']++; memset(dp,0,sizeof(dp)); dp[0][0]=1; for(Int i=1;i