output_description: Let m be the number of operations in your solution. In the first line, print
  m. In the i-th of the subsequent m lines, print the numbers x and y chosen in
  the i-th operation, with a space in between. The output will be considered
  correct if m is between 0 and 2N (inclusive) and a satisfies the condition
  after the m operations.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
      a_1 a_2 ... a_{N}
attempt: #!/usr/bin/env python3
  
  import sys
  
  # import time
  # import math
  # import numpy as np
  # import scipy.sparse.csgraph as cs            # csgraph_from_dense(ndarray, null_value=inf), bellman_ford(G, return_predecessors=True), dijkstra, floyd_warshall
  # import random                                # random, uniform, randint, randrange, shuffle, sample
  # import string                                # ascii_lowercase, ascii_uppercase, ascii_letters, digits, hexdigits
  # import re                                    # re.compile(pattern) => ptn obj; p.search(s), p.match(s), p.finditer(s) => match obj; p.sub(after, s)
  # from bisect import bisect_left, bisect_right # bisect_left(a, x, lo=0, hi=len(a)) returns i such that all(val<x for val in a[lo:i]) and all(val>-=x for val in a[i:hi]).
  # from collections import deque                # deque class. deque(L): dq.append(x), dq.appendleft(x), dq.pop(), dq.popleft(), dq.rotate()
  # from collections import defaultdict          # subclass of dict. defaultdict(facroty)
  # from collections import Counter              # subclass of dict. Counter(iter): c.elements(), c.most_common(n), c.subtract(iter)
  # from datetime import date, datetime          # date.today(), date(year,month,day) => date obj; datetime.now(), datetime(year,month,day,hour,second,microsecond) => datetime obj; subtraction => timedelta obj
  # from datetime.datetime import strptime       # strptime('2019/01/01 10:05:20', '%Y/%m/%d/ %H:%M:%S') returns datetime obj
  # from datetime import timedelta               # td.days, td.seconds, td.microseconds, td.total_seconds(). abs function is also available.
  # from copy import copy, deepcopy              # use deepcopy to copy multi-dimentional matrix without reference
  # from functools import reduce                 # reduce(f, iter[, init])
  # from functools import lru_cache              # @lrucache ...arguments of functions should be able to be keys of dict (e.g. list is not allowed)
  # from heapq import heapify, heappush, heappop # built-in list. heapify(L) changes list in-place to min-heap in O(n), heappush(heapL, x) and heappop(heapL) in O(lgn).
  # from heapq import nlargest, nsmallest        # nlargest(n, iter[, key]) returns k-largest-list in O(n+klgn).
  # from itertools import count, cycle, repeat   # count(start[,step]), cycle(iter), repeat(elm[,n])
  # from itertools import groupby                # [(k, list(g)) for k, g in groupby('000112')] returns [('0',['0','0','0']), ('1',['1','1']), ('2',['2'])]
  # from itertools import starmap                # starmap(pow, [[2,5], [3,2]]) returns [32, 9]
  # from itertools import product, permutations  # product(iter, repeat=n), permutations(iter[,r])
  # from itertools import combinations, combinations_with_replacement
  # from itertools import accumulate             # accumulate(iter[, f])
  # from operator import itemgetter              # itemgetter(1), itemgetter('key')
  # from fractions import gcd                    # for Python 3.4 (previous contest @AtCoder)
  
  
  def main():
      mod = 1000000007  # 10^9+7
      inf = float("inf")  # sys.float_info.max = 1.79...e+308
      # inf = 2 ** 64 - 1             # (for fast JIT compile in PyPy) 1.84...e+19
      sys.setrecursionlimit(10**6)  # 1000 -> 1000000
  
      def input():
          return sys.stdin.readline().rstrip()
  
      def ii():
          return int(input())
  
      def mi():
          return map(int, input().split())
  
      def mi_0():
          return map(lambda x: int(x) - 1, input().split())
  
      def lmi():
          return list(map(int, input().split()))
  
      def lmi_0():
          return list(map(lambda x: int(x) - 1, input().split()))
  
      def li():
          return list(input())
  
      def change_to_all_pos_or_all_neg(L):
          n = len(L)
          M = max(L)
          M_ind = L.index(M)
          m = min(L)
          m_ind = L.index(m)
          assert M > 0 and m < 0
          if M >= abs(m):
              for i in range(n):
                  L[i] += M
              command = [[M_ind + 1, i + 1] for i in range(n)]
          else:
              for i in range(n):
                  L[i] += m
              command = [[m_ind + 1, i + 1] for i in range(n)]
          return command
  
      def change_to_non_increasing(L):
          pivot = max(L) if all(map(lambda x: x >= 0, L)) else min(L)
          pivot_ind = L.index(pivot)
          command = [[pivot_ind + 1, 1]] + [[i, i + 1] for i in range(1, n)]
          return command
  
      n = ii()
      L = lmi()
      command = []
      if all(map(lambda x: x >= 0, L)):
          cnt = n
          command += change_to_non_increasing(L)
      elif all(map(lambda x: x <= 0, L)):
          cnt = n
          command += change_to_non_increasing(L)
      else:
          cnt = 2 * n
          command += change_to_all_pos_or_all_neg(L)
          command += change_to_non_increasing(L)
  
      print(cnt)
      for a, b in command:
          print("{} {}".format(a, b))
  
  
  if __name__ == "__main__":
      main()
  
problem_description: Statement
  
  Snuke has an integer sequence, a, of length N. The i-th element of a
  (1-indexed) is a_{i}.
  
  He can perform the following operation any number of times:
  
    * Operation: Choose integers x and y between 1 and N (inclusive), and add a_x to a_y.
  
  He would like to perform this operation between 0 and 2N times (inclusive) so
  that a satisfies the condition below. Show one such sequence of operations. It
  can be proved that such a sequence of operations always exists under the
  constraints in this problem.
  
    * Condition: a_1 \leq a_2 \leq ... \leq a_{N}
samples: [{"input": "3\n    -2 5 -1", "output": "2\n    2 3\n    3 3\n    \n\n  * After the first operation, a = (-2,5,4).\n  * After the second operation, a = (-2,5,8), and the condition is now satisfied.\n\n* * *"}, {"input": "2\n    -1 -3", "output": "1\n    2 1\n    \n\n  * After the first operation, a = (-4,-3) and the condition is now satisfied.\n\n* * *"}, {"input": "5\n    0 0 0 0 0", "output": "0\n    \n\n  * The condition is satisfied already in the beginning."}]