题解 | #密码截取#

经典题目，注意代码规范

#include <bits/stdc++.h>
using namespace std;

int maxLength (const string str, int l, int r) {
	while (l >= 0 && r < str.size() && str[l] == str[r]) {
		l--;
		r++;
	}
	return r - l - 1;
}
int main() {
	string str;
	cin >> str;
	int n = str.size();
	if (n == 0) {
		cout << 0 << endl;
		return 0;
	}
	if (n == 1) {
		cout << 1 << endl;
		return 0;
	}
	int ml = 0;
	for (int i = 0; i < n; i++) {
		int m1 = maxLength (str, i, i);
		int m2 = maxLength (str, i, i + 1);
		ml = max (ml, max (m1, m2));
	}
	cout << ml;
	return 0;
}