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59 changes: 59 additions & 0 deletions WEEK14/BOJ_23326/dajeong.java
Original file line number Diff line number Diff line change
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.TreeSet;

public class Main {

public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int N = Integer.parseInt(st.nextToken());
int Q = Integer.parseInt(st.nextToken());

// 이진검색트리 (트리셋) 사용
// 명소만 저장하기
TreeSet<Integer> popular = new TreeSet<>();

st = new StringTokenizer(br.readLine());
for (int i = 1; i <= N; i++) {
int card = Integer.parseInt(st.nextToken());
if (card == 1) {
popular.add(i);
}
}

int pos = 1;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < Q; i++) {
st = new StringTokenizer(br.readLine());
int command = Integer.parseInt(st.nextToken());
if (command == 1) {
int idx = Integer.parseInt(st.nextToken());
if (popular.contains(idx)) {
popular.remove(idx);
} else {
popular.add(idx);
}
} else if (command == 2) {
int move = Integer.parseInt(st.nextToken());
pos = (pos + move) % N;
if (pos == 0) pos = N;
} else if (command == 3) {
if (popular.isEmpty()) {
sb.append(-1).append("\n"); // 명소가 없는 경우 불가능
} else { // 명소가 있는 경우
Integer t = popular.ceiling(pos); // upperbound (도현이 다음 명소의 위치)
if (t == null) { // 도현이 이후에 명소가 없는 경우
sb.append((popular.first() + N - pos)%N).append("\n");
} else { // 도현이 이후에 명소가 있는 경우
sb.append((t - pos)%N).append("\n");
}
}
}
}

System.out.println(sb.toString());
}
}