Merkkijonot

input/code.cpp: In function 'int main()':
input/code.cpp:24:13: error: 'strlen' is not a member of 'std'
    if (std::strlen(v[i]) != std::strlen(v[j]))
             ^~~~~~
input/code.cpp:24:13: note: suggested alternative:
In file included from input/code.cpp:2:0:
/usr/include/string.h:384:15: note:   'strlen'
 extern size_t strlen (const char *__s)
               ^~~~~~
input/code.cpp:24:34: error: 'strlen' is not a member of 'std'
    if (std::strlen(v[i]) != std::strlen(v[j]))
                                  ^~~~~~
input/code.cpp:24:34: note: suggested alternative:
In file included from input/code.cpp:2:0:
/usr/include/string.h:384:15: note:   'strlen'
 extern size_t strlen (const char *__s)
               ^~~~~~
input/code.cpp:27:29: error: 'strlen' is not a member of 'std'
    for (int k = 0; k < std::strlen(v[i]); k++)
                             ^~~~~~
input/code.cpp:27:29: note: suggested alternative:
In file included from input/code.cpp:2:0:
/usr/include/string.h:384:15...

#include<iostream>
#include<string.h>
 
int main()
{
	int n;
	std::cin >> n;
 
	char v[100000][50];
	for (int i = 0; i < n; i++)
	{
		scanf("%50s", v[i]);
	}
 
	int count = 0;
	bool b;
 
	for (int i = 0; i < n; i++)
	{
		for (int j = i+1; j < n; j++)
		{
			b = true;
 
			if (std::strlen(v[i]) != std::strlen(v[j]))
				b = false;
 
			for (int k = 0; k < std::strlen(v[i]); k++)
			{
				for (int l = k + 1; l < std::strlen(v[i]); l++)
				{
					if ((v[i][k] == v[i][l]) != (v[j][k] == v[j][l]))
						b = false;
				}
			}
 
			count += b;
		}
	}
 
	std::cout << count;
 
	return 0;
}