Sukat

input/code.cpp: In function 'int main()':
input/code.cpp:34:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~

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

using namespace std;

string s;
int idx[30];

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

struct Node{
    int cnt,id;
};

Node MaxList(){
    Node ret;
    ret.id=0;
    ret.cnt=0;
    for(int i=1;i<=26;i++){
        if(idx[i]>=ret.cnt){
            ret.cnt=idx[i];
            ret.id=i;
        }
    }
    return ret;
}

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