[20250922] BOJ / G4 / 점심메뉴 / 김민진

zinnnn37/202509/22 BOJ G4 점심메뉴.md

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+```java
+import java.io.*;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class BJ_12099_점심메뉴 {
+
+	private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+	private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	private static final StringBuilder   sb = new StringBuilder();
+	private static       StringTokenizer st;
+
+	private static int N;
+	private static int Q;
+
+	private static Node[] taste;
+	private static int[]  sweetness;
+
+	private static class Node implements Comparable<Node> {
+		int spiciness;
+		int sweetness;
+
+		Node(int s, int w) {
+			spiciness = s;
+			sweetness = w;
+		}
+
+		@Override
+		public int compareTo(Node o) {
+			return Integer.compare(this.spiciness, o.spiciness);
+		}
+	}
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol();
+	}
+
+	private static void init() throws IOException {
+		st = new StringTokenizer(br.readLine());
+		N  = Integer.parseInt(st.nextToken());
+		Q  = Integer.parseInt(st.nextToken());
+
+		taste = new Node[N];
+		for (int i = 0; i < N; i++) {
+			st = new StringTokenizer(br.readLine());
+
+			int s = Integer.parseInt(st.nextToken());
+			int w = Integer.parseInt(st.nextToken());
+
+			taste[i] = new Node(s, w);
+		}
+
+		Arrays.sort(taste);
+	}
+
+	private static void sol() throws IOException {
+		while (Q-- > 0) {
+			st = new StringTokenizer(br.readLine());
+
+			int s1 = Integer.parseInt(st.nextToken());
+			int s2 = Integer.parseInt(st.nextToken());
+			int w1 = Integer.parseInt(st.nextToken());
+			int w2 = Integer.parseInt(st.nextToken());
+
+			int left  = lowerBound(s1);
+			int right = upperBound(s2);
+
+			if (left >= right) {
+				sb.append("0\n");
+				continue;
+			}
+
+			int cnt = 0;
+			for (int i = left; i < right; i++) {
+				if (w1 <= taste[i].sweetness && taste[i].sweetness <= w2) {
+					cnt++;
+				}
+			}
+			sb.append(cnt).append("\n");
+		}
+		bw.write(sb.toString());
+		bw.flush();
+		bw.close();
+		br.close();
+	}
+
+	// s1 이상인 첫 번째 인덱스
+	private static int lowerBound(int target) {
+		int left  = 0;
+		int right = N;
+
+		while (left < right) {
+			int mid = left + (right - left) / 2;
+
+			if (taste[mid].spiciness < target) {
+				left = mid + 1;
+			} else {
+				right = mid;
+			}
+		}
+		return left;
+	}
+
+	// s2 초과인 첫 번째 인덱스
+	private static int upperBound(int target) {
+		int left  = 0;
+		int right = N;
+
+		while (left < right) {
+			int mid = left + (right - left) / 2;
+
+			if (taste[mid].spiciness <= target) {
+				left = mid + 1;
+			} else {
+				right = mid;
+			}
+		}
+		return left;
+	}
+
+}
+```