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#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstring>
 
 
template <typename T>
T maxn(const T[], const int);
 
template <> const char * maxn<char *>(const char * [], const int);
 
 
int main(void)
{
	using namespace std;
 
 
 
	return 0;
}
 
template <typename T>
T maxn(const T arr[], int size)
{
	T max = arr[0];
 
	for (int i = 1; i < size; i++)
		if (arr[i] > arr[i - 1])
			max = arr[i];
 
	return max;
}
 
template <> const char * maxn<char *>(const char * arr[], int const size)
{
	int imaxlength = 0;
	for (int i = 1; i < size; i++)
	{
		if (strlen(arr[i]) > strlen(arr[i - 1]))
			imaxlength = i;
	}
	return arr[imaxlength];
}

prog.cpp:9:26: error: template-id ‘maxn<char*>’ for ‘const char* maxn(const char**, int)’ does not match any template declaration
 template <> const char * maxn<char *>(const char * [], const int);
                          ^~~~~~~~~~~~
prog.cpp:7:3: note: candidate is: template<class T> T maxn(const T*, int)
 T maxn(const T[], const int);
   ^~~~
prog.cpp:33:26: error: template-id ‘maxn<char*>’ for ‘const char* maxn(const char**, int)’ does not match any template declaration
 template <> const char * maxn<char *>(const char * arr[], int const size)
                          ^~~~~~~~~~~~
prog.cpp:22:3: note: candidate is: template<class T> T maxn(const T*, int)
 T maxn(const T arr[], int size)
   ^~~~

Standard output is empty