04. Printing Triangle

#include <iostream>
#include <string>

using namespace std;

void printTiangle(int n) {
    string result = "";

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            result += to_string(j) + " ";
        }
        result += "\n";
    }
    for (int i = n; i > 0; i--) {
        for (int j = 1; j < i; j++) {
            result += to_string(j) + " ";
        }
        result += "\n";
    }
    cout << result;
}

int main() {
    int n;
    cin >> n;

    printTiangle(n);

    return 0;
}