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#include <iostream>
using namespace std;

void numpat(int n)
{

	int num = 1;

	for (int i = 0; i < n; i++) {

		for (int j = 0; j <= i; j++)
			cout << num << " ";

		num = num + 1;

		cout << endl;
	}
}

int main()
{
	int n = 5;

	numpat(n);
	return 0;
}

Success #stdin #stdout 0.01s 5280KB
stdin
Standard input is empty
stdout
1 
2 2 
3 3 3 
4 4 4 4 
5 5 5 5 5