[20250909] BOJ / G1 / 수열과 쿼리 16 / 김민진

zinnnn37/202509/9 BOJ G1 수열과 쿼리 16.md

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+```java
+import java.io.*;
+import java.util.StringTokenizer;
+
+public class BJ_14428_수열과_쿼리_16 {
+
+	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, M;
+	private static int[]  nums;
+	private static Node[] segTree;
+
+	private static class Node {
+		int index;
+		int value;
+
+		Node(int index, int value) {
+			this.index = index;
+			this.value = value;
+		}
+
+		@Override
+		public String toString() {
+			return "[ " + this.index + " : " + this.value + " ]";
+		}
+	}
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol();
+	}
+
+	private static void init() throws IOException {
+		N = Integer.parseInt(br.readLine());
+
+		nums = new int[N + 1];
+		st   = new StringTokenizer(br.readLine());
+		for (int i = 1; i <= N; i++) {
+			nums[i] = Integer.parseInt(st.nextToken());
+		}
+		M = Integer.parseInt(br.readLine());
+
+		segTree = new Node[N * 4];
+		initSegTree(1, N, 1);
+	}
+
+	private static Node initSegTree(int start, int end, int node) {
+		if (start == end) {
+			segTree[node] = new Node(start, nums[start]);
+			return segTree[node];
+		}
+
+		int mid = (start + end) / 2;
+
+		return segTree[node] = compareNodes(initSegTree(start, mid, node * 2)
+				, initSegTree(mid + 1, end, node * 2 + 1));
+	}
+
+	private static void sol() throws IOException {
+		while (M-- > 0) {
+			st = new StringTokenizer(br.readLine());
+
+			int cmd = Integer.parseInt(st.nextToken());
+			int x   = Integer.parseInt(st.nextToken());
+			int y   = Integer.parseInt(st.nextToken());
+
+			if (cmd == 1) {
+				update(1, 1, N, new Node(x, y));
+			} else if (cmd == 2) {
+				Node target = getMinIndexNode(1, 1, N, x, y);
+				sb.append(target.index).append("\n");
+			}
+		}
+		bw.write(sb.toString());
+		bw.flush();
+		bw.close();
+		br.close();
+	}
+
+	private static void update(int node, int start, int end, Node val) {
+		if (val.index < start || end < val.index) {
+			return;
+		}
+
+		if (start == end) {
+			segTree[node] = val;
+			return;
+		}
+
+		int mid = (start + end) / 2;
+
+		update(node * 2, start, mid, val);
+		update(node * 2 + 1, mid + 1, end, val);
+
+		segTree[node] = compareNodes(segTree[node * 2], segTree[node * 2 + 1]);
+	}
+
+	private static Node getMinIndexNode(int node, int start, int end, int left, int right) {
+		if (right < start || end < left) {
+			return null;
+		}
+
+		if (left <= start && end <= right) {
+			return segTree[node];
+		}
+
+		int mid = (start + end) / 2;
+
+		return compareNodes(getMinIndexNode(node * 2, start, mid, left, right)
+				, getMinIndexNode(node * 2 + 1, mid + 1, end, left, right));
+	}
+
+	private static Node compareNodes(Node n1, Node n2) {
+		if (n1 == null) return n2;
+		if (n2 == null) return n1;
+
+		if (n1.value == n2.value) {
+			return n1.index < n2.index ? n1 : n2;
+		}
+		return n1.value < n2.value ? n1 : n2;
+	}
+
+}
+```