判断回文字符串

#include <iostream>
#include<cstring>
using namespace std;

int main()
{
    char a[100];
    int k = 0,flag = 0;
    cin>>a;
    k =  strlen(a);
    for(int i=0; i<k; i++,k--)
    {
        if(a[i] !=a[k-1])
        {
            flag = 1;
        }
    }
    if(flag)
        cout<<"No"<<endl;
    else
        cout<<"Yes"<<endl;
    return 0;
}