Map
小乐乐查找数字
http://www.nowcoder.com/questionTerminal/4c49a3a1559141f7a080a48c98cca4cb
import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
Map<Integer, Integer> m = new HashMap<>();
int n = sc.nextInt();
while (n-- > 0){
int k = sc.nextInt();
if(m.containsKey(k)) m.put(k, m.get(k) + 1);
else m.put(k, 1);
}
int k = sc.nextInt();
if(!m.containsKey(k)) m.put(k, 0);
System.out.println(m.get(k));
}
}
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