[Link] https://www.acmicpc.net/problem/11723
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import java.util.*;
import java.io.*;
public class Main {
static BufferedReader br;
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
int m = toi(br.readLine());
String[] line;
int bits = 0;
for(int i = 0; i < m; i++) {
line = getLine();
if(line[0].equals("add")) {
int x = toi(line[1]) - 1;
bits = bits | 1 << x;
} else if(line[0].equals("remove")) {
int x = toi(line[1]) - 1;
bits &= ~(1 << x);
} else if(line[0].equals("check")) {
int x = toi(line[1]) - 1;
sb.append((bits & 1 << x) == 0 ? 0 : 1).append("\n");
} else if(line[0].equals("toggle")) {
int x = toi(line[1]) - 1;
bits = bits ^ 1 << x;
} else if(line[0].equals("all")) {
bits = (1 << 20) - 1;
} else bits = 0;
}
print(sb);
}
static int toi(String s) { return Integer.parseInt(s); }
static String[] getLine() throws IOException { return br.readLine().split(" "); }
static int[] getArr() throws IOException { return Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); }
static <T> void print(T s) { System.out.print(s); }
static <T> void println(T s) { System.out.println(s); }
}