Pattern problem

#1

not able to build logic for pattern problem in the assignment.

#2 
int n; cin >> n;
for (int i = 0; i < n; i++) {
	for (int j = i + 1; j <= 2 * i + 1; j++) {
		cout << j;
	}
	for (int j = 2 * i; j >= i + 1; j--) {
		cout << j;
	}
	cout << "\n";
}

@nitesh16
i loop handles the no of line.
j loop handles each line.

#3

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