#include <bits/stdc++.h> using namespace std; int main() { int tc ; cin >> tc ; while(tc--){ string s ; cin >> s; int n = s.size() ; vector<vector<int>>dp(n,vector<int>(n,-1)) ; function<int(int,int)> calc = [&](int L,int R)->int{ if(L >= R) return 0 ; int &ret = dp[L][R] ; if(~ret) return ret ; if(s[L] == s[R]) return ret = calc(L + 1,R - 1) ; else return ret = min(1 + calc(L + 1,R),1 + calc(L,R - 1)) ; }; int cnt = calc(0,n - 1) ; int L = 0 , R = n - 1 ; string ans ; while(L <= R){ if(s[L] == s[R]) ans.push_back(s[L]) , L ++ , R -- ; else{ if(dp[L][R] != dp[L][R - 1]){ ans.push_back(s[R]) ; R -- ; }else{ ans.push_back(s[L]) , L ++ ; } } } string tmp = ans ; reverse(begin(ans),end(ans)) ; if(cnt + n < 2*ans.size()) tmp.pop_back() ; cout << cnt << endl ; cout << tmp << ans << endl ; } return 0; }
Standard input is empty
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