Sukat

input/code.cpp: In function 'int main()':
input/code.cpp:36:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(ll i=0;i<s.size();i++){
      |                ~^~~~~~~~~

#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<queue>

using namespace std;

typedef long long ll;

string s;
ll idx[100];

ll ans;
char anslist[100009][2];

struct Node{
    ll cnt,id;
};

Node MaxList(){
    Node ret;
    ret.id=0;
    ret.cnt=0;
    for(ll i=0;i<26;i++){
        if(idx[i]>=ret.cnt){
            ret.cnt=idx[i];
            ret.id=i;
        }
    }
    return ret;
}

int main(){
    cin>>s;
    for(ll i=0;i<s.size();i++){
        idx[s[i]-'A']++;
    }
    Node a1=MaxList();
    while(true){
        idx[a1.id]=0;
        Node a2=MaxList();
        if(a2.cnt==0)break;
        idx[a1.id]=a1.cnt-a2.cnt;
        for(ll i=1;i<=a2.cnt;i++){
            ans++;
            anslist[ans][0]=(char)(a1.id+'A');
            anslist[ans][1]=(char)(a2.id+'A');
        }
        idx[a2.id]=0;
        a1=MaxList();
        // cout<<endl;
        // for(ll i=1;i<=26;i++){
        //     cout<<(char)(i-1+'A')<<":"<<idx[i]<<" ";
        // }
    }
    cout<<ans<<endl;
    for(ll i=1;i<=ans;i++){
        cout<<anslist[i][0]<<anslist[i][1]<<endl;
    }
    return 0;
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 2, 3

Verdict: ACCEPTED

Test 12

Group: 2, 3

Verdict: ACCEPTED

Test 13

Group: 2, 3

Verdict: WRONG ANSWER

Test 14

Group: 2, 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: WRONG ANSWER

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED

Test 19

Group: 3

Verdict: ACCEPTED

Test 20

Group: 3

Verdict: WRONG ANSWER

Test 21

Group: 3

Verdict: ACCEPTED