Problem:
Score: 500 points

Problem Statement

You are the top spy of AtCoder Kingdom. To prevent the stolen secret from being handed to AlDebaran Kingdom, you have sneaked into the party where the transaction happens.

There are N attendees in the party, and they are given attendee numbers from 1 through N. The height of Attendee i is A_i.

According to an examination beforehand, you know that a pair of attendees satisfying the condition below will make the transaction.

The absolute difference of their attendee numbers is equal to the sum of their heights.

There are \frac{N(N-1)}{2} ways to choose two from the N attendees and make a pair. Among them, how many satisfy the condition above?

P.S.: We cannot let you know the secret.

Constraints

All values in input are integers.

2 \leq N \leq 2 \times 10^5

1 \leq A_i \leq 10^9\ (1 \leq i \leq N)

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 \dots A_N

Output

Print the number of pairs satisfying the condition.

Sample Input 1

6
2 3 3 1 3 1

Sample Output 1

3

A_1 + A_4 = 3, so the pair of Attendee 1 and 4 satisfy the condition.

A_2 + A_6 = 4, so the pair of Attendee 2 and 6 satisfy the condition.

A_4 + A_6 = 2, so the pair of Attendee 4 and 6 satisfy the condition.

No other pair satisfies the condition, so you should print 3.

Sample Input 2

6
5 2 4 2 8 8

Sample Output 2

0

No pair satisfies the condition, so you should print 0.

Sample Input 3

32
3 1 4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5

Sample Output 3

22

Solution in Rust (1.42.0) (judge verdict: Accepted)

#![allow(dead_code)]
use crate::counter::Counter;
use crate::scanner::Scanner;
fn main() {
    let mut scan = Scanner::new();
    let n = scan.read::<usize>();
    let a = scan.readn::<i64>(n);
    let mut l = Counter::new();
    let mut r = Counter::new();
    for i in 0..n {
        l[i as i64 + a[i]] += 1;
        r[i as i64 - a[i]] += 1;
    }
    let mut ret = 0;
    for &x in l.keys() {
        ret += l[x] * r[x];
    }
    println!("{}", ret);
}
mod scanner {
    use std::io::{stdin, BufReader, Bytes, Read, Stdin};
    use std::str::FromStr;
    pub struct Scanner {
        buf: Bytes<BufReader<Stdin>>,
    }
    impl Scanner {
        pub fn new() -> Scanner {
            Scanner {
                buf: BufReader::new(stdin()).bytes(),
            }
        }
        pub fn read_next<T: FromStr>(&mut self) -> Option<T> {
            let token = self
                .buf
                .by_ref()
                .map(|c| c.unwrap() as char)
                .skip_while(|c| c.is_whitespace())
                .take_while(|c| !c.is_whitespace())
                .collect::<String>();
            token.parse::<T>().ok()
        }
        pub fn read<T: FromStr>(&mut self) -> T {
            self.read_next().unwrap()
        }
        pub fn readn<T: FromStr>(&mut self, n: usize) -> Vec<T> {
            (0..n).map(|_| self.read::<T>()).collect()
        }
        pub fn chars(&mut self) -> Vec<char> {
            self.read::<String>().chars().collect()
        }
    }
}
mod counter {
    use std::collections::HashMap;
    use std::hash::Hash;
    use std::ops::*;
    #[derive(Clone, Debug)]
    pub struct Counter<K: Eq + Hash> {
        pub cnt: HashMap<K, i64>,
        pub d: i64,
    }
    impl<K: Eq + Hash> Counter<K> {
        pub fn new() -> Counter<K> {
            Counter {
                cnt: HashMap::new(),
                d: 0,
            }
        }
        #[doc = " Remove key when the value <= 0"]
        pub fn dec(&mut self, key: K, delta: i64) {
            if self.peek(&key) - delta <= 0 {
                self.remove(&key);
            } else {
                *self.cnt.get_mut(&key).unwrap() -= delta;
            }
        }
        pub fn peek(&self, key: &K) -> i64 {
            *self.cnt.get(key).unwrap_or(&self.d)
        }
    }
    impl<K: Eq + Hash> Deref for Counter<K> {
        type Target = HashMap<K, i64>;
        fn deref(&self) -> &Self::Target {
            &self.cnt
        }
    }
    impl<K: Eq + Hash> DerefMut for Counter<K> {
        fn deref_mut(&mut self) -> &mut Self::Target {
            &mut self.cnt
        }
    }
    impl<K: Eq + Hash> Index<K> for Counter<K> {
        type Output = i64;
        fn index(&self, index: K) -> &Self::Output {
            self.cnt.get(&index).unwrap_or(&self.d)
        }
    }
    impl<K: Eq + Hash + Clone> IndexMut<K> for Counter<K> {
        fn index_mut(&mut self, index: K) -> &mut i64 {
            if !self.cnt.contains_key(&index) {
                self.cnt.insert(index.clone(), self.d);
            }
            self.cnt.get_mut(&index).unwrap()
        }
    }
    impl<K: Eq + Hash> std::iter::FromIterator<K> for Counter<K> {
        fn from_iter<T: IntoIterator<Item = K>>(iter: T) -> Self {
            let mut cnt = HashMap::new();
            for i in iter {
                *cnt.entry(i).or_insert(0) += 1;
            }
            Counter { cnt, d: 0 }
        }
    }
    impl<T: Eq + Hash + Clone> Add for Counter<T> {
        type Output = Counter<T>;
        fn add(self, other: Counter<T>) -> Counter<T> {
            let mut ret = Counter::new();
            for (k, v) in self.iter().chain(other.iter()) {
                ret[k.clone()] += *v;
            }
            ret
        }
    }
    impl<T: Eq + Hash + Clone> AddAssign for Counter<T> {
        fn add_assign(&mut self, other: Self) {
            *self = self.clone().add(other);
        }
    }
}