isogram.cpp

// NOTE: it is recommended to use this even if you don't understand the following code.

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

// input data
int N;
string S;

int main() {
//  uncomment the following lines if you want to read/write from files
	ifstream cin("input.txt");
	ofstream cout("output.txt");

    cin >> N;
    cin.ignore();
	
	int isogram = 0;
	
    for (int test=0; test<N; test++) {
        getline(cin, S);

        // insert your code here
		for (int i=0; i<S.size(); i++) {
			if (S[i]>=65 && S[i]<= 90 || S[i]>=97 && S[i]<= 122) {
				S[i] = toupper(S[i]);
			}
		}
		
		bool iso = true;
		
		for (int i=65; i<=90; i++) {
			int num = count(S.begin(), S.end(), (char) i);
			if (num > 2) {
				iso = false;
				break;
			}
		}
		
		if (iso) {
			isogram ++;
		}
		
    }
	
	cout << isogram << endl; // print the result
    return 0;
}