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  1. #include <bits/stdc++.h>
  2. #define F first
  3. #define S second
  4. #define ll long long
  5. using namespace std;
  6. signed main() {
  7.     ios_base::sync_with_stdio(0);
  8.     cin.tie(0);
  9.     cout.tie(0);
  10.     // 9th grade
  11.     string s;
  12.     int n;
  13.     cin>>n>>s;
  14.     map<char, int> mp;
  15.     for(int i = 0; i < s.size(); i++) {
  16.         mp[s[i]]++;
  17.     }
  18.     set<char> st;
  19.     st.insert(s.begin(), s.end());
  20.     char c;
  21.     int cnt = 0;
  22.     for(char i : st) {
  23.         if(mp[i]%2!=0) {
  24.             c=i;
  25.             cnt++;
  26.         }
  27.     }
  28.     if(cnt!=1) {
  29.         cout<<"NOT POSSIBLE\n";
  30.         return 0;
  31.     }
  32.     if(st.size()==1) {
  33.         for(int i = 0; i < s.size()/2; i++) {
  34.             cout<<s[i];
  35.         }
  36.         return 0;
  37.     }
  38.     int g = 0;
  39.     bool ok=0;
  40.     for(int i = 0; i < s.size(); i++) {
  41.         if(s[i]==c&&!ok) {ok=1;g=i;break;}
  42.     }
  43.     if(g==0&&s[s.size()-1]==c) {
  44.         cout<<"NOT UNIQUE\n";
  45.     } else {
  46.         string s1, s2;
  47.         for(int i = 0; i < s.size(); i++) {
  48.             if(i<s.size()/2)
  49.             s1+=s[i];
  50.             else 
  51.             s2+=s[i];
  52.         }
  53.         int i = 0, j = 0;
  54.         while(true) {
  55.             if(s1[i]==s2[j]) {
  56.                 i++, j++;
  57.             } else if(s1[i]!=s2[j]) {
  58.                 j++;
  59.             }
  60.             if(i>=s1.size()||j>=s2.size()) break;
  61.         }
  62.         if(i==s1.size()) {
  63.             cout<<s1<<'\n';
  64.             return 0;
  65.         }
  66.         s1="", s2="";
  67.         for(int i = 0; i < s.size(); i++) {
  68.             if(i<s.size()/2+1)
  69.             s1+=s[i];
  70.             else 
  71.             s2+=s[i];
  72.         }
  73.         i = 0, j = 0;
  74.         while(true) {
  75.             if(s2[i]==s1[j]) {
  76.                 i++, j++;
  77.             } else if(s2[i]!=s1[j]) {
  78.                 j++;
  79.             }
  80.             if(i>=s2.size()||j>=s1.size()) break;
  81.         }
  82.         if(i==s2.size()) {
  83.             cout<<s2<<'\n';
  84.             return 0;
  85.         }
  86.         cout<<"NOT POSSIBLE\n";
  87.     }
  88.     // end of code
  89. }
Success #stdin #stdout 0s 5284KB
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Standard input is empty
stdout
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NOT POSSIBLE
https://ideone.com/QFpuHV
language:
C++14 (gcc 8.3)
created:
6 hours ago
visibility:
public

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