Submission #1269057

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269057		nathan4690	Longest beautiful sequence (IZhO17_subsequence)	C++20	100 / 100	3472 ms	174472 KiB

subsequence

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define f1(i,n) for(int i=1;i<=n;i++)
#define __file_name ""
using namespace std;
const ll maxn=1e6+5, inf=1e18;

int n, a[maxn], k[maxn];
pair<int,int> dp[1 << 10][1 << 10][21];
int trace[maxn], rdp[maxn];

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if(fopen(__file_name ".inp", "r")){
        freopen(__file_name ".inp", "r", stdin);
        freopen(__file_name ".out", "w", stdout);
    }
    // code here
    cin >> n;
    f1(i,n) cin >> a[i];
    f1(i,n) cin >> k[i];
    f1(i,n){
        rdp[i] = 1;
        int m1 = a[i] >> 10, m2 = a[i] & ((1 << 10) - 1);
        for(int mask = 0; mask < (1 << 10); mask++){
            int cnt = __builtin_popcount(mask & m2);
            if(cnt <= k[i]){
                if(rdp[i] < dp[m1][mask][k[i] - cnt].first + 1){
                    rdp[i] = dp[m1][mask][k[i] - cnt].first + 1;
                    trace[i] = dp[m1][mask][k[i] - cnt].second;
                }
            }
        }
        for(int mask = 0; mask < (1 << 10); mask++){
            int cnt = __builtin_popcount(mask & m1);
            if(dp[mask][m2][cnt].first < rdp[i]){
                dp[mask][m2][cnt].first = rdp[i];
                dp[mask][m2][cnt].second = i;
            }
        }
    }
    int valdp = 0, idx = 0;
    f1(i,n){
        if(valdp < rdp[i]){
            valdp = rdp[i];
            idx = i;
        }
    }
    vector<int> ans;
    while(idx > 0){
        ans.push_back(idx);
        idx = trace[idx];
    }
    reverse(ans.begin(), ans.end());
    cout << ans.size() << '\n';
    for(int i: ans) cout << i << ' ';
    return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen(__file_name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen(__file_name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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