Staircase - https://www.hackerrank.com/challenges/staircase

staircase.cpp

#include <iostream>
#include <string>

using namespace std;


int main(){
    int n;
    cin >> n;
    
    for (int i = 1; i <= n; i++) {
        string output = string(n - i, ' ');
        output += string(i, '#');
        cout << output << endl;
    }
    return 0;
}