[20251102] BOJ / G1 / 수열과 쿼리 17 / 김민진

Author: zinnnn37

zinnnn37/202511/2 BOJ G1 수열과 쿼리 17.md

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+```java
+import java.io.*;
+import java.util.StringTokenizer;
+
+public class BJ_14438_수열과_쿼리_17 {
+
+    private static final int INF = Integer.MAX_VALUE;
+
+    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, segTree;
+
+    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];
+        segTree = new int[N * 4];
+        st = new StringTokenizer(br.readLine());
+        for (int i = 1; i <= N; i++) {
+            nums[i] = Integer.parseInt(st.nextToken());
+        }
+
+        initSegTree(1, 1, N);
+
+        M = Integer.parseInt(br.readLine());
+    }
+
+    private static void sol() throws IOException {
+        while (M-- > 0) {
+            st = new StringTokenizer(br.readLine());
+
+            int cmd = Integer.parseInt(st.nextToken());
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+
+            if (cmd == 1) {
+                update(1, 1, N, a, b);
+            } else if (cmd == 2) {
+                bw.write(getMin(1, 1, N, a, b) + "\n");
+            }
+        }
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static int initSegTree(int node, int start, int end) {
+        if (start == end) {
+            return segTree[node] = nums[start];
+        }
+
+        int mid = start + (end - start) / 2;
+
+        return segTree[node] = Math.min(initSegTree(node * 2, start, mid), initSegTree(node * 2 + 1, mid + 1, end));
+    }
+
+    private static int update(int node, int start, int end, int target, int update) {
+        if (target < start || end < target) {
+            return segTree[node];
+        }
+
+        if (start == end) {
+            return segTree[node] = update;
+        }
+
+        int mid = start + (end - start) / 2;
+
+        int left = update(node * 2, start, mid, target, update);
+        int right = update(node * 2 + 1, mid + 1, end, target, update);
+
+        return segTree[node] = Math.min(left, right);
+    }
+
+    private static int getMin(int node, int start, int end, int left, int right) {
+        if (right < start || end < left) {
+            return INF;
+        }
+
+        if (left <= start && end <= right) {
+            return segTree[node];
+        }
+
+        int mid = start + (end - start) / 2;
+
+        return Math.min(getMin(node * 2, start, mid, left, right)
+                , getMin(node * 2 + 1, mid + 1, end, left, right));
+    }
+
+}
+```