Problem: This problem is given in two editions, which differ exclusively in the constraints on the number n.

You are given an array of integers a[1], a[2], ..., a[n]. A block is a sequence of contiguous (consecutive) elements a[l], a[l+1], ..., a[r] (1 ≤ l ≤ r ≤ n). Thus, a block is defined by a pair of indices (l, r).

Find a set of blocks (l_1, r_1), (l_2, r_2), ..., (l_k, r_k) such that:

  * They do not intersect (i.e. they are disjoint). Formally, for each pair of blocks (l_i, r_i) and (l_j, r_j) where i ≠ j either r_i < l_j or r_j < l_i. 
  * For each block the sum of its elements is the same. Formally, $$$a[l_1]+a[l_1+1]+...+a[r_1]=a[l_2]+a[l_2+1]+...+a[r_2]= ... = a[l_k]+a[l_k+1]+...+a[r_k].$$$ 
  * The number of the blocks in the set is maximum. Formally, there does not exist a set of blocks (l_1', r_1'), (l_2', r_2'), ..., (l_{k'}', r_{k'}') satisfying the above two requirements with k' > k. 

<image> The picture corresponds to the first example. Blue boxes illustrate blocks.

Write a program to find such a set of blocks.

Input

The first line contains integer n (1 ≤ n ≤ 1500) — the length of the given array. The second line contains the sequence of elements a[1], a[2], ..., a[n] (-10^5 ≤ a_i ≤ 10^5).

Output

In the first line print the integer k (1 ≤ k ≤ n). The following k lines should contain blocks, one per line. In each line print a pair of indices l_i, r_i (1 ≤ l_i ≤ r_i ≤ n) — the bounds of the i-th block. You can print blocks in any order. If there are multiple answers, print any of them.

Examples

Input


7
4 1 2 2 1 5 3


Output


3
7 7
2 3
4 5


Input


11
-5 -4 -3 -2 -1 0 1 2 3 4 5


Output


2
3 4
1 1


Input


4
1 1 1 1


Output


4
4 4
1 1
2 2
3 3

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int N = 5000;
const int H = 1e9;
const int sx[4] = {1, -1, 0, 0};
const int sy[4] = {0, 0, 1, -1};
mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());
int main() {
  srand(time(0));
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int a[n];
  for (auto &to : a) cin >> to;
  int pref[n + 1];
  for (int i = 0; i < n; ++i) {
    if (!i)
      pref[1] = a[i];
    else
      pref[i + 1] = pref[i] + a[i];
  }
  pref[0] = 0;
  map<int, vector<pair<int, int>>> lol;
  for (int i = 1; i <= n; ++i)
    for (int j = i; j <= n; ++j) lol[pref[j] - pref[i - 1]].push_back({j, i});
  vector<pair<int, int>> WANI4KA_LOXONYLCYA;
  for (auto to : lol) {
    vector<pair<int, int>> mem = to.second;
    vector<pair<int, int>> now;
    sort(mem.begin(), mem.end());
    int Wanickka_LOLLX = -1;
    for (auto ot : mem)
      if (Wanickka_LOLLX < ot.second)
        Wanickka_LOLLX = ot.first, now.push_back({ot.second, ot.first});
    if (WANI4KA_LOXONYLCYA.size() < now.size()) WANI4KA_LOXONYLCYA = now;
  }
  cout << WANI4KA_LOXONYLCYA.size() << '\n';
  for (auto to : WANI4KA_LOXONYLCYA)
    cout << to.first << " " << to.second << '\n';
  return 0;
}