#include <iostream>
#include <vector>

void getArray (std::vector<std::vector<int>>& ary, int n) {
	ary.resize (n);
	for (int i = 0; i < n; i++) {
		ary [i].resize (i+1);
	}
}

int main() {
	std::vector<std::vector<int>> ary;
	getArray (ary, 42);
	return 0;
}