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For all those who were like me , trying to find solution for java....
just use the above one or fast IO (make sure u do the same justice with output also) with your own implementation........
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter out = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
List<Integer> result = new ArrayList<>();
int n = Integer.parseInt(in.readLine());
HashMap<Long, Long> map = new HashMap<Long, Long>();
HashMap<Long, Long> freq = new HashMap<Long, Long>();
for (int i = 0; i < n; i++) {
StringTokenizer s= new StringTokenizer(in.readLine());
int a = Integer.parseInt(s.nextToken());
final long b = Long.parseLong(s.nextToken());
switch (a) {
case 1:
freq.computeIfPresent(map.get(b), (k, v) -> v == 1 ? freq.remove(map.get(b)) : v - 1);
map.compute(b, (k, v) -> v == null ? 1 : v + 1);
freq.compute(map.get(b), (k, v) -> v == null ? 1 : v + 1);
break;
case 2:
freq.computeIfPresent(map.get(b), (k, v) -> v == 1 ? freq.remove(map.get(b)) : v - 1);
map.computeIfPresent(b, (k, v) -> v == 1 ? map.remove(b) : v - 1);
freq.compute(map.get(b), (k, v) -> v == null ? 1 : v + 1);
break;
case 3:
result.add(freq.containsKey(b) ? 1 : 0);
break;
}
}
out.write(result.stream().map(Object::toString).collect(joining("\n")) + "\n");
in.close();
out.close();
}
}
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For all those who were like me , trying to find solution for java.... just use the above one or fast IO (make sure u do the same justice with output also) with your own implementation........
OR
import java.io.; import java.util.; import static java.util.stream.Collectors.joining;
public class Solution { public static void main(String[] args) throws IOException {
}