Leetcode 647. Palindromic Substrings

Given a string s, return the number of palindromic substrings in it.

A string is a palindrome when it reads the same backward as forward.

A substring is a contiguous sequence of characters within the string.

题目

class Solution {
public:
    int countSubstrings(string s) {
        n=s.size();
        int sum=0;
        for(int i=0;i=0&&r