Sukat

input/code.cpp: In function 'void solve()':
input/code.cpp:134:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  134 |    for (int i = 0; i < ans.size(); ++i) {
      |                    ~~^~~~~~~~~~~~

#include<bits/stdc++.h>
using namespace std;
 
void init_code(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif 
}
 
void solve() {
   string s;
   cin >> s;
 
   int n = s.size();
 
   vector<pair<int, int>> tmp(26);
 
   for (int i = 0; i < n; ++i) {
      int x = s[i] - 'A';
 
      tmp[x].first++;
      tmp[x].second = x;
   }


   priority_queue<pair<int, int>, vector<pair<int, int>>, std::greater<pair<int, int>>> pq;
   int mxi = 0, mx = 0;

   for (int i = 0; i < 26; ++i) {
      for (int it = 0; it < 26; ++it) {
         if (it != i && tmp[it].first != 0)
            pq.push(tmp[it]);
      }

      int total = 0, last = 0;
      while (!pq.empty()) {
         pair<int, int> a = pq.top();
         pq.pop();

         //cout << a.first << ' ' << a.second << '\n';

         last = a.first;

         if (pq.empty()) break;
    
         pair<int, int> b = pq.top();
         pq.pop();

         swap(a, b);
         //cout << a.first << ' ' << a.second << '\n';
         //cout << b.first << ' ' << b.second << '\n';

         if (a.first == 0 || b.first == 0) continue;

         /*
         string t = "";
         char x = 'A' + a.second, y = 'A' + b.second;
         t += x; t += y;
    
         int k = b.first;
    
         for (int i = 0; i < k; ++i) {
            ans.push_back(t);
         }*/

         total += b.first;

         pq.push({a.first - b.first, a.second}); 
      }

      total += (min(last, tmp[i].first));
      if (total > mx) {
         mx = total;
         mxi = i;
      }

      while (!pq.empty()) {
         pq.pop();
      }
   }

   vector<string> ans;
   for (int it = 0; it < 26; ++it) {
      if (it != mxi && tmp[it].first != 0)
            pq.push(tmp[it]);
   }

   pair<int, int> lst;
   while (!pq.empty()) {
      pair<int, int> a = pq.top();
      pq.pop();

      //cout << a.first << ' ' << a.second << '\n';

      lst = a;

      if (pq.empty()) break;
    
      pair<int, int> b = pq.top();
      pq.pop();

      swap(a, b);

      //cout << a.first << ' ' << a.second << '\n';
      //cout << b.first << ' ' << b.second << '\n';

      if (a.first == 0 || b.first == 0) continue;

      string t = "";
      char x = 'A' + a.second, y = 'A' + b.second;
      t += x; t += y;
    
      int k = b.first;
    
      for (int i = 0; i < k; ++i) {
         ans.push_back(t);
      }

      pq.push({a.first - b.first, a.second}); 
   }
   
   string t = "";
   char x = 'A' + lst.second, y = 'A' + tmp[mxi].second;
   t += x; t += y;

   for (int i = 0; i < min(lst.first, tmp[i].first); ++i) {
      ans.push_back(t);
   }

   cout << ans.size() << '\n';
   for (int i = 0; i < ans.size(); ++i) {
      cout << ans[i] << '\n';
   }
}
 
int main() {
   init_code();
   solve();
   return 0;
}

Test 1

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 6

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: WRONG ANSWER

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: WRONG ANSWER

Test 11

Group: 2, 3

Verdict: WRONG ANSWER

Test 12

Group: 2, 3

Verdict: WRONG ANSWER

Test 13

Group: 2, 3

Verdict: WRONG ANSWER

Test 14

Group: 2, 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: WRONG ANSWER

Test 18

Group: 3

Verdict: WRONG ANSWER

Test 19

Group: 3

Verdict: WRONG ANSWER

Test 20

Group: 3

Verdict: WRONG ANSWER

Test 21

Group: 3

Verdict: WRONG ANSWER