Submission #1108839

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108839		dubabuba	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	1 ms	336 KiB

subsequence

#include <bits/stdc++.h>
using namespace std;

const int mxn = 5050;
int a[mxn], dp[mxn];
int b[mxn], pr[mxn];
int n;

int main() {
// #ifndef LOCAL
	freopen("subsequence.in", "r", stdin);
	freopen("subsequence.out", "w", stdout);
// #endif

	cin >> n;
	for(int i = 1; i <= n; i++)
		cin >> a[i];
	for(int i = 1; i <= n; i++)
		cin >> b[i];

	int id = 1;
	for(int i = 1; i <= n; i++) {
		dp[i] = 1;
		for(int j = 1; j < i; j++) {
			int t = a[i] & a[j];
			if(__builtin_popcount(t) != b[i])
				continue;
			if(dp[j] + 1 > dp[i]) {
				dp[i] = dp[j] + 1;
				pr[i] = j;
			}
		}

		if(dp[id] < dp[i])
			id = i;
	}

	vector<int> ind;
	while(id) {
		ind.push_back(id);
		id = pr[id];
	}

	reverse(ind.begin(), ind.end());
	// if(ind.size()) return 1;
	cout << (int)ind.size() << endl;
	for(int i : ind)
		cout << i << ' ';
	cout << endl;
	return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:11:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  freopen("subsequence.in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  freopen("subsequence.out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 60