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- package opstini;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.util.ArrayList;
- import java.util.HashMap;
- public class Opstini {
- public static void main(String[] args) throws NumberFormatException, IOException {
- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
- int broj_opstini = Integer.parseInt(br.readLine());
- HashMap<String, ArrayList<Float>> map = new HashMap<String, ArrayList<Float>>(broj_opstini);
- for (int i = 0; i < broj_opstini; i++) {
- String[] podeleno = br.readLine().split(" ");
- if (map.get(podeleno[0]) == null) {
- float vrednost = Float.parseFloat(podeleno[1]);
- ArrayList<Float> lista = new ArrayList<Float>();
- lista.add(vrednost);
- map.put(podeleno[0], lista);
- } else if (map.get(podeleno[0]) != null) {
- float vrednost = Float.parseFloat(podeleno[1]);
- ArrayList<Float> lista = map.get(podeleno[0]);
- lista.add(vrednost);
- map.put(podeleno[0], lista);
- }
- }
- String opstina = br.readLine();
- if(map.get(opstina)!=null){
- ArrayList<Float>lista = map.get(opstina);
- float suma = 0;
- float rezultat = 0;
- for(int i = 0 ; i < lista.size(); i++){
- suma+=lista.get(i);
- }
- rezultat = suma/lista.size();
- System.out.println(rezultat);
- }
- }
- }
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