Submission #1276992

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276992		icebear	Longest beautiful sequence (IZhO17_subsequence)	C++20	100 / 100	3666 ms	182640 KiB

subsequence

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

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 1e5 + 5;
int n, a[N], k[N];
ii f[MASK(10)][MASK(10)][22];
int dp[N], trace[N];

void init(void) {
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n) cin >> k[i];
}

void process(void) {
    FOR(i, 1, n) {
        int l = a[i] & (MASK(10) - 1);
        int r = a[i] >> 10;

        ii mx = mp(0, 0);
        REP(mask, MASK(10)) maximize(mx, f[mask][r][k[i] - __builtin_popcount(l & mask)]);
        dp[i] = mx.fi + 1;
        trace[i] = mx.se;

        ii nxt = mp(mx.fi + 1, i);
        REP(mask, MASK(10)) maximize(f[l][mask][__builtin_popcount(mask & r)], nxt);
    }

    int j = max_element(dp + 1, dp + n + 1) - dp;
    vector<int> ans;
    while(j > 0) {
        ans.pb(j);
        j = trace[j];
    }
    reverse(all(ans));
    cout << ans.size() << '\n';
    for(int x : ans) cout << x << ' ';
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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