合肥工业大学oj 1232 Hi,there ereht,iH

//分奇偶从中心向两边扩展判断回文即可
#include<iostream>
using namespace std;

string str;
int MAX, index;

void solution(int, int);

int main(){
    while(getline(cin, str)){
        if(str == "#"){
            break;
        }
        MAX = 0, index = 0;
        for(int i = 0; i < str.length() - 1; i++){
            solution(i, i + 1);
            solution(i, i);
        }
        cout << str.substr(index, MAX) << endl;
    }
    
    return 0;
}

void solution(int left, int right){
    while(left >= 0 && right < str.length()){
        if(str[left] == str[right]){
            left--;
            right++;
        }else{
            break;
        }
    }
    if(MAX < right - left - 1){
        MAX = right - left - 1;
        index = left + 1;
    }
}

//presented by 大吉大利。今晚AC