'''
# Sample code to perform I/O:
 
name = input()                  # Reading input from STDIN
print('Hi, %s.' % name)         # Writing output to STDOUT
 
# Warning: Printing unwanted or ill-formatted data to output will cause the test cases to fail
'''
 
# Write your code here
from itertools import accumulate
 
def execute():
    n = int(input())
    array = list(map(int, input().strip().split()))
    
    cumulative = [0] + list(accumulate(array))
    # print(cumulative)
    total = sum(array)
    result = []
    for l in range(n):
        for r in range(l, n):
            n_array = r - l + 1
            sum_array = cumulative[r+1] - cumulative[l]
            if not (sum_array / n_array <= (total - sum_array) / (n - n_array or 1)):
                result.append((l+1, r+1))
    print(len(result))
    print("\n".join("{} {}".format(l,r) for l, r in sorted(result)))
 
if __name__ == "__main__":
    execute()