백준 1965 c++

#include <iostream>
#include <vector>

using namespace std;

void input_data(vector<int>& box) {
	cout << "\ninput_data()\n";
	int i, n, x;

	cin >> n;
	for (i = 0; i < n; i++) {
		cin >> x;
		box.push_back(x);
	}
	
	return;
}

int find_answer(vector<int>& box) {
	cout << "\nfind_answer()\n";
	int answer = 1;
	int n = box.size();
	int i, j;
	vector<int> DP(n, 1);

	for (i = 0; i < n; i++) {
		for (j = 0; j < i; j++) {
			if (box[i] > box[j]) {
				DP[i] = max(DP[i], DP[j] + 1);
				answer = max(answer, DP[i]);
			}
		}
		for (j = 0; j < n; j++) {
			cout << DP[j] << " ";
		}
		cout << " answer : " << answer << "\n";
	}

	return answer;
}	


int main(void) {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	vector<int> box;

	input_data(box);
	cout << find_answer(box) << "\n";

	return 0;
}