#include <stdio.h>
#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
#include <sstream>
#include <set>
#include <map>
#include <stack>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <string>
using namespace std;
#define ll long long
#define pi pair<int,int>
#define pll pair<ll,ll>
#define pii pair<int,pi>
#define X first
#define Y second
#define pb push_back
#define ab(x) ((x)<0?(-(x)):(x))
#define xx(x) ((x)*(x))
#define mp make_pair
#define vi vector<int>
#define vll vector<ll>
#define vs vector<string>
#define vpi vector<pi>
#define vpll vector<pll>
#define ALL(x) (x).begin(),(x).end()
#define Max (1<<30)
#define LLMax (1ll<<60)
template<class T>string ToString(T t){stringstream s;s<<t;return s.str();}
template<class T>void ToOther(T&t,string a){stringstream s(a);s>>t;}
char a[100005];
string A;
string Get(int x){
string r;
bool same=1;
string mid="";
for(int s=0,e=x-1;s<=e;s++,e--){
if(s==e){
if(same==0){
mid+='a';
}else{
mid+=A[s];
}
}else{
if(same==0){
r+='a';
}else{
char t=max(A[s],A[e]);
r+=t;
if(t>A[s])same=0;
}
}
}
string r2=r;reverse(ALL(r2));
return r+mid+r2;
}
void UP(string &A){
int n=A.size();
int s,e;
s=n/2;e=n/2;
if(A.size()%2==0)e++;
A[s]++;
for(s;s>=0;s--,e++){
if(A[s]>'z'){
A[s]='a';
A[e]='a';
A[s-1]++;
A[e+1]++;
}else break;
}
}
int main(){
scanf("%s",&a);
A=a;
int n=A.size();
string L=Get(n/2);
string L1=A.substr(0,n/2);
string mid="";
string R2="";
if(A.size()%2){
R2=A.substr(n/2+1);
mid+=A[n/2];
}else{
R2=A.substr(n/2);
}
bool up=1;
if(L==L1)up=0;
if(up){
if(mid.size())mid="a";
cout<<L<<mid<<L<<endl;
}else{
if(R2<=L){
cout<<L<<mid<<L;
}else{
UP(L);
if(mid.size())mid="a";
cout<<L<<mid<<L;
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
1924 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
