(SPOJ) 1745 - Recuperação - Solução

import java.io.*;
import java.util.*;

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    static int gambis(BufferedReader br) throws NumberFormatException, IOException {
        int n;
        int resp = 0;
        int sinal = 1;
        while (true) {
            n = br.read();
            if (n >= '0' && n <= '9') break;
            if (n == '-') sinal = -1;
            if (n == '+') sinal = 1;
        }
        while (true) {
            resp = resp*10 + n-'0';
            n = br.read();
            if (n < '0' || n > '9') break;
        }

        return resp*sinal;
    }
   
    void processa() throws NumberFormatException, IOException {
        String line = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
       
        int contador = 0;           
        while((line = br.readLine()) != null) {
            int qteValores = Integer.parseInt(line);
            int soma = 0;
            int valorSatisfaz = -5000;
            boolean primeiraVez = true;
            for (int i = 0; i < qteValores; i++) {
                int valor = gambis(br);
                if (primeiraVez && valor == soma) {
                    valorSatisfaz = valor;
                    primeiraVez = false;
                }
                soma += valor;
            }
           
            contador++;
            if (valorSatisfaz != -5000) {
                bw.write("Instancia " + contador + "\n" + valorSatisfaz + "\n\n");
            }
            else {
                bw.write("Instancia " + contador + "\nnao achei\n\n");
            }
        }

        bw.flush();
        bw.close();                   
        return;
    }
}