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| #include <bits/stdc++.h>
#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
using namespace std;
struct PairHash {inline std::size_t operator()(const std::pair<int, int> &v) const { return v.first * 31 + v.second; }};
#define Code ios_base::sync_with_stdio(false);
#define By ios::sync_with_stdio(0);
#define Sumfi cout.tie(NULL);
using ll = long long;
using ld = long double;
using ull = unsigned long long;
const ld PI = 3.14159265358979323846;
const ll INF = 1e18;
const ld EPS = 1e-9;
const ll MAX_N = 101010;
const ll mod = 1e9 + 7;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef array<ll,3> all3;
typedef array<ll,5> all5;
typedef vector<all3> vall3;
typedef vector<all5> vall5;
typedef vector<ld> vld;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<int> vi;
typedef pair<string, string> pss;
typedef vector<pss> vpss;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef unordered_set<ll> usll;
typedef unordered_set<pll, PairHash> uspll;
typedef unordered_map<ll, ll> umll;
typedef unordered_map<pll, ll, PairHash> umpll;
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,m,n) for(ll i=n;i>=m;i--)
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define ASCEND(a) iota(all(a),0)
#define sz(x) ll((x).size())
#define pyes cout<<"Yes\n";
#define pno cout<<"No\n";
#define pneg1 cout<<"-1\n";
#define ppossible cout<<"Possible\n";
#define pimpossible cout<<"Impossible\n";
#define CASE(x) cout<<"Case #"<<x<<": ";
template <typename T>
void print(T &&t) { cout << t << "\n"; }
template<typename T>
void printv(vector<T>v){ll n=v.size();rep(i,0,n)cout<<v[i]<<" ";cout<<"\n";}
void fileIO() {freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);}
ll __gcd(ll x, ll y) { return !y ? x : __gcd(y, x % y); }
ll __lcm(ll x, ll y) { return x / __gcd(x,y) * y; }
ll modpow(ll n, ll x, ll MOD = mod) { if(!x) return 1; ll res = modpow(n,x>>1,MOD); res = (res * res) % MOD; if(x&1) res = (res * n) % MOD; return res; }
string manacher(string s) {
string ext = "#";
for(auto& ch : s) {
ext.push_back(ch);
ext.push_back('#');
}
ll l = 0, r = -1, n = sz(ext);
ll lmatch = -1, rmatch = -1;
vll dp(n);
rep(i,0,n) {
dp[i] = max(0ll, min(r - i, r + l - i >= 0 ? dp[r + l - i] : -1));
while(i + dp[i] < n and i - dp[i] >= 0 and ext[i + dp[i]] == ext[i - dp[i]])
dp[i]++;
if(i - dp[i] == -1) lmatch = i;
if(i + dp[i] == n and rmatch == -1) rmatch = i;
if(i + dp[i] > r) {
r = i + dp[i];
l = i - dp[i];
}
}
if(lmatch == -1 and rmatch == -1) return "";
string left = "", right = "";
if(lmatch != -1) {
rep(i,lmatch - dp[lmatch] + 1, lmatch + dp[lmatch]) if(ext[i] != '#') left.push_back(ext[i]);
}
if(rmatch != -1) {
rep(i,rmatch - dp[rmatch] + 1, rmatch + dp[rmatch]) if(ext[i] != '#') right.push_back(ext[i]);
}
return sz(left) > sz(right) ? left : right;
}
string solve(string s) {
string left = "", right = "";
ll l = 0, r = sz(s) - 1;
while(s[l] == s[r] and l <= r) {
if(l == r) return s;
left.push_back(s[l++]);
right.push_back(s[r--]);
}
string pal = manacher(s.substr(l,r-l + 1));
reverse(all(right));
return left + pal + right;
}
int main() {
Code By Sumfi
cout.precision(12);
ll tc = 1;
cin>>tc;
rep(i,1,tc+1) {
string s;
cin>>s;
print(solve(s));
}
return 0;
}
|
