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164 lines (139 loc) · 4.32 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 B {
private static final class BIT {
private final int n;
private final long[] data;
private BIT(int n) {
this.n = n;
data = new long[n + 1];
}
public void add(int idx, long val) {
for (int i = idx + 1; i <= n; i += lsb(i)) {
data[i] += val;
}
}
public long sum(int l, int r) {
return sum(r) - sum(l - 1);
}
private long sum(int idx) {
long res = 0;
for (int i = idx + 1; i > 0; i -= lsb(i)) {
res += data[i];
}
return res;
}
private static int lsb(int i) {
return i & -i; // zeroes all the bits except the least significant one
}
// get k-th element
public int getKth(int k) {
int lo = 0;
int hi = n;
while (lo < hi) {
final int mid = lo + hi >>> 1;
if (k > sum(mid)) {
lo = mid + 1;
} else {
hi = mid;
}
}
return lo;
}
}
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 BIT bit = new BIT(n);
for (int i = 0; i < n; i++) {
bit.add(i, fs.nextInt());
}
for (int i = 0; i < q; i++) {
final int type = fs.nextInt();
if (type == 0) {
final int idx = fs.nextInt();
final int val = fs.nextInt();
bit.add(idx, val);
} else {
final int l = fs.nextInt();
final int r = fs.nextInt() - 1;
pw.println(bit.sum(l, r));
}
}
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;
}
}
}