分段故障(核心转储）C++错误

我得到了"Segmentation fault（core dumped）"错误，代码如下：

#include <iostream>
#include <cstring>
template <class T>
T maxn(T* elements, int n);
template <> const char* maxn <const char*>(const char* elements[], int num);
int main(){
    using namespace std;
    //Using template
    int num[6] = {2, 3, 4, 5, 6, 22};
    double num2[4] = {16.6, 10.5, 2.3, 1.1};
    int larg = maxn(num, 6);
    double larg2 = maxn(num2, 4);
    cout << larg << endl << larg2 << endl;
    //Using specialization
    const char* pps[5] = {"Hello", "There", "I", "am", "me"};
    const char* largest = maxn(pps, 5);
    cout << largest << endl; 
    return 0;

}    
//return largest element in an array of T of n elements
template <class T>
T maxn(T* elements, int n){
    T largest = 0;
    for (int i=0; i<n; i++)
        largest = elements[i] > largest ? elements[i] : largest;
    return largest;
}    
//Returns address that points to the largest string
template <> const char* maxn <const char*>(const char* elements[], int num){
    int longest = 0;
    int i =0;
    for (i=0; i<num; i++)
        if (strlen(elements[i]) > strlen(elements[longest]))
            longest = i;
    return elements[i];
} 

我收到了"警告：不推荐使用从字符串常量到'char*的转换"错误，但后来我将一些char*数组和函数参数更改为const char*，并将其删除。现在编译代码，我得到以下输出：

22

16.6

分段故障（核心转储）

前两行是对的，但我不明白第三行会发生什么。请帮忙，谢谢。