Submission #1014976

#	Time	Username	Problem	Language	Result	Execution time	Memory
1014976		Thunnus	Longest beautiful sequence (IZhO17_subsequence)	C++17	0 / 100	0 ms	348 KiB

subsequence

#include<bits/stdc++.h>
using namespace std;
using i64 = long long;
#define int i64
#define vi vector<int>
#define vvi vector<vi>
#define vb vector<bool>
#define pii pair<int, int>
#define fi first
#define se second
#define sz(x) (int)(x).size()

void setIO(string s){
    ios_base::sync_with_stdio(false); cin.tie(0);
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

signed main() {
	//setIO("sequence");
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n;
    pii best = {1, 0};
    cin >> n;
    vi a(n), k(n);
    for(int &i : a)
        cin >> i;
    for(int &i : k)
        cin >> i;

    vi prev(n), dp(n, 1), ans;
    iota(prev.begin(), prev.end(), 0);
    for(int i = 1; i < n; i++){
        for(int j = 0; j < n; j++){
            if(__builtin_popcount(a[j] & a[i]) == k[i] && dp[j] + 1 > dp[i]){
                dp[i] = dp[j] + 1;
                prev[i] = j;
                if(dp[i] > best.fi)
                    best = {dp[i], i};
            }
        }
    }

    while(prev[best.se] != best.se){
        ans.emplace_back(best.se + 1);
        best.se = prev[best.se];
    }
    ans.emplace_back(best.se + 1);
    reverse(ans.begin(), ans.end());
    cout << best.fi << "\n";
    for(int i : ans){
        cout << i << " ";
    }
	return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'void setIO(std::string)':
subsequence.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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