Codigos/1051C.cpp at master · tfarnecim/Codigos · GitHub

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#include <bits/stdc++.h>
using namespace std;

vector <int> aparece[200];

int main(){

	int n;

	cin >> n;

	int arr[n];

	int ajuda = 0;

	for(int i=0;i<n;i++){

		cin >> arr[i];

		aparece[ arr[i] ].push_back(i);

		if(aparece[ arr[i] ].size() == 3){

			ajuda++;

		}

	}

	int uns = 0;

	for(int i=1;i<=100;i++){

		if(aparece[i].size() == 1){
			uns++;
		}

	}

	if(uns%2!=0 && !ajuda){

		cout << "NO\n";
		return 0;

	}

	bool A = true;

	string saida;

	for(int i=0;i<n;i++){

		saida += ' ';

	}

	for(int i=0;i<n;i++){

		if(aparece[arr[i]].size()==1){

			if(A){

				saida[i] = 'A';
				A = false;

			}else{

				saida[i] = 'B';
				A = true;

			}

		}

		if(aparece[arr[i]].size()==2){

			saida[i] = 'A';

		}

	}

	for(int i=1;i<=100;i++){

		if(aparece[i].size() > 2 && uns%2==0){

			for(int c=0;c<aparece[i].size();c++){

				int pos = aparece[i][c];

				saida[pos] = 'A';

			}

		}else if(aparece[i].size() > 2 && uns%2!=0){

			saida[aparece[i][0]] = 'B';

			for(int c=1;c<aparece[i].size();c++){

				int pos = aparece[i][c];

				saida[pos] = 'A';

			}

			uns++;

		}

	}

	cout << "YES\n";
	cout << saida << endl;

	return 0;
}