Codeforces Pangram in c++

/*
   problem:
   https://codeforces.com/problemset/problem/520/A
*/
---------------------------------------------------------------------------------------------
  
  #include<iostream>
#include<algorithm>
#include<vector>
using namespace std;

int main()
{
	int n;
	cin >> n;
	char ch;
	vector<char> v;
	for (int i = 0; i < n; i++)
	{
		cin >> ch;
		v.push_back(ch);
	}
	//
    for (int i = 0; i < n; i++)
	{
		if (v[i] >= 'a' && v[i] <= 'z')
			v[i] -= 32;
	}
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	int count = 0;
	for (int i = 0; i < v.size(); i++)
	{
		if ((v[i] >= 'A' && v[i] <= 'Z') || (v[i] >= 'a' && v[i] <= 'z'))
			count++;
	}
	if (count >= 26)
		cout << "YES\n";
	else
		cout << "NO\n";
	

	return 0;
}

Source: codegrepper.com

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