Commit 739893e

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O(n^2) time and O(1) space using concept of expansion around the center.

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	`1`	`+class Solution:`
	`2`	`+ def dfs(self, left, right,s):`
	`3`	`+ final = 0`
	`4`	`+ while left >= 0 and right < len(s) and s[left] == s[right]:`
	`5`	`+ left -= 1`
	`6`	`+ right += 1`
	`7`	`+ final += 1`
	`8`	`+ return final`
	`9`	`+`
	`10`	`+ def countSubstrings(self, s: str) -> int:`
	`11`	`+ result = 0`
	`12`	`+ for i in range(len(s)):`
	`13`	`+ result += self.dfs(i,i,s)`
	`14`	`+ result += self.dfs(i,i+1,s)`
	`15`	`+ return result`

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