Submission #630620

#	Time	Username	Problem	Language	Result	Execution time	Memory
630620		Do_you_copy	Longest beautiful sequence (IZhO17_subsequence)	C++17	100 / 100	3571 ms	89564 KiB

subsequence

#include <bits/stdc++.h>
//#define int long long
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 1e5 + 1;
const int maxH = 1025;
const int maxK = 21;
int n;
int f[maxH][maxH][maxK];
pii dp[maxN];
int a[maxN];
int p[maxN];
pii ans = {0, -1};

void Init(){
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    for (int i = 1; i <= n; ++i) cin >> p[i];
    memset(f, -1, sizeof(f));
    for (int i = 1; i <= n; ++i){
        int l = a[i] >> 10;
        int r = a[i] & ((1 << 10) - 1);
        dp[i] = {1, -1};
        for (int j = 0; j < 1 << 10; ++j){
            int cntl = __builtin_popcount(j & l);
            const int &k = p[i];
            int cntr = k - cntl;
            if (cntr < 0 || cntr > 10) continue;
            if (f[j][r][cntr] != -1){
                dp[i] = max(dp[i], {dp[f[j][r][cntr]].fi + 1, f[j][r][cntr]});
            }
        }
        ans = max(ans, {dp[i].fi, i});
        for (int j = 0; j < 1 << 10; ++j){
            int cntr = __builtin_popcount(j & r);
            if (f[l][j][cntr] == -1 || dp[f[l][j][cntr]].fi <= dp[i].fi)
            f[l][j][cntr] = i;
        }
    }
    vector <int> res;
    cout << ans.fi << "\n";
    ll last = ans.se;
    while (last != -1){
        res.pb(last);
        last = dp[last].se;
    }
    reverse(res.begin(), res.end());
    for (int i: res) cout << i << " ";
}

#define debu
#define taskname "test"
signed main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        #ifdef debug
        freopen(taskname".out", "w", stdout);
        #endif
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << 1000 * double(clock()) / CLOCKS_PER_SEC;
        #ifndef debug
        cerr << "\nTime elapsed: " << 1000 * double(clock()) / CLOCKS_PER_SEC << "ms\n";
        #endif
    }
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
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(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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