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181 lines (157 loc) · 5.19 KB
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package atcoder.acl;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Random;
import java.util.StringTokenizer;
public final class J {
private static class SegTree {
int leftMost, rightMost;
SegTree left, right;
int max;
SegTree(int leftMost, int rightMost, int[] arr) {
this.leftMost = leftMost;
this.rightMost = rightMost;
if (leftMost == rightMost) {
max = arr[leftMost];
} else {
final int mid = leftMost + rightMost >>> 1;
left = new SegTree(leftMost, mid, arr);
right = new SegTree(mid + 1, rightMost, arr);
recalc();
}
}
private void recalc() {
if (leftMost == rightMost) {
return;
}
max = Math.max(left.max, right.max);
}
private int query1(int l, int r) {
if (r < leftMost || l > rightMost) {
return Integer.MIN_VALUE;
}
if (l <= leftMost && rightMost <= r) {
return max;
}
return Math.max(left.query1(l, r), right.query1(l, r));
}
private int query2(int k, int l) {
if (max < k || rightMost < l) {
return -1;
}
if (leftMost == rightMost) {
return leftMost;
}
final int resL = left.query2(k, l);
return resL != -1 ? resL : right.query2(k, l);
}
private void update(int idx, int val) {
if (leftMost == rightMost) {
max = val;
} else {
final int mid = leftMost + rightMost >>> 1;
if (idx <= mid) {
left.update(idx, val);
} else {
right.update(idx, val);
}
recalc();
}
}
}
public static void main(String[] args) {
final FastScanner fs = new FastScanner();
final PrintWriter pw = new PrintWriter(System.out);
final int n = fs.nextInt();
final int q = fs.nextInt();
final int[] arr = fs.nextIntArray(n);
final SegTree st = new SegTree(0, n - 1, arr);
for (int i = 0; i < q; i++) {
final int type = fs.nextInt();
if (type == 1) {
final int idx = fs.nextInt() - 1;
final int val = fs.nextInt();
st.update(idx, val);
} else if (type == 2) {
final int l = fs.nextInt() - 1;
final int r = fs.nextInt() - 1;
pw.println(st.query1(l, r));
} else {
final int idx = fs.nextInt() - 1;
final int val = fs.nextInt();
final int res = st.query2(val, idx);
pw.println(res == -1 ? n + 1 : res + 1);
}
}
pw.close();
}
static final class Utils {
public static void shuffleSort(int[] arr) {
shuffle(arr);
Arrays.sort(arr);
}
public static void shuffleSort(long[] arr) {
shuffle(arr);
Arrays.sort(arr);
}
public static void shuffle(int[] arr) {
final Random r = new Random();
for (int i = 0; i <= arr.length - 2; i++) {
final int j = i + r.nextInt(arr.length - i);
swap(arr, i, j);
}
}
public static void shuffle(long[] arr) {
final Random r = new Random();
for (int i = 0; i <= arr.length - 2; i++) {
final int j = i + r.nextInt(arr.length - i);
swap(arr, i, j);
}
}
public static void swap(int[] arr, int i, int j) {
final int t = arr[i];
arr[i] = arr[j];
arr[j] = t;
}
public static void swap(long[] arr, int i, int j) {
final long t = arr[i];
arr[i] = arr[j];
arr[j] = t;
}
private Utils() {}
}
static class FastScanner {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer("");
private String next() {
while (!st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
//noinspection CallToPrintStackTrace
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
int[] nextIntArray(int n) {
final int[] a = new int[n];
for (int i = 0; i < n; i++) { a[i] = nextInt(); }
return a;
}
long[] nextLongArray(int n) {
final long[] a = new long[n];
for (int i = 0; i < n; i++) { a[i] = nextLong(); }
return a;
}
}
}