message: Update number-of-equal-count-substrings.py
diff: @@ -14,7 +14,7 @@ class Solution(object):
  for i, c in enumerate(s):
  cnt[c] += 1
  equal_cnt += (cnt[c] == count)
  - if count*l <= i:
  + if i >= count*l:
  equal_cnt -= (cnt[s[i-count*l]] == count)
  cnt[s[i-count*l]] -= 1
  result += (equal_cnt == l)
  