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126 lines (107 loc) · 3.29 KB
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package codeforces.probability;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.StringTokenizer;
// https://codeforces.com/gym/306143
public final class C {
private static final int MOD = 998244353;
public static void main(String[] args) {
final FastScanner fs = new FastScanner();
final int n = fs.nextInt();
final int[] arr = fs.nextIntArray(n);
final Map<Integer, Integer> lastIdx = new HashMap<>();
for (int i = 0; i < n; i++) {
lastIdx.put(arr[i], i);
}
int groups = 0;
int curr = 0;
for (int i = 0; i < n; i++) {
curr = Math.max(curr, lastIdx.get(arr[i]));
if (curr == i) {
groups++;
}
}
groups -= 1;
long res = 1;
long pow = 2;
while (groups > 0) {
if (groups % 2 == 1) {
res = res * pow % MOD;
}
pow = pow * pow % MOD;
groups /= 2;
}
System.out.println(res);
}
static final class Utils {
public static void shuffleSort(int[] x) {
shuffle(x);
Arrays.sort(x);
}
public static void shuffleSort(long[] x) {
shuffle(x);
Arrays.sort(x);
}
public static void shuffle(int[] x) {
final Random r = new Random();
for (int i = 0; i <= x.length - 2; i++) {
final int j = i + r.nextInt(x.length - i);
swap(x, i, j);
}
}
public static void shuffle(long[] x) {
final Random r = new Random();
for (int i = 0; i <= x.length - 2; i++) {
final int j = i + r.nextInt(x.length - i);
swap(x, i, j);
}
}
public static void swap(int[] x, int i, int j) {
final int t = x[i];
x[i] = x[j];
x[j] = t;
}
public static void swap(long[] x, int i, int j) {
final long t = x[i];
x[i] = x[j];
x[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;
}
}
}