Submission #1115237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1115237		_callmelucian	Longest beautiful sequence (IZhO17_subsequence)	C++14	100 / 100	2448 ms	48828 KiB

subsequence

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

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pl;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tpl;

#define all(a) a.begin(), a.end()
#define filter(a) a.erase(unique(all(a)), a.end())

const int SEP = 10, BIT = 20, mn = 1e5 + 5;
int bestMask[1 << SEP][1 << SEP][SEP + 1], dp[mn], a[mn], k[mn];

void trace (int i) {
    for (int j = i - 1; j >= 0; j--) {
        if (__builtin_popcount(a[j] & a[i]) == k[i] && dp[j] + 1 == dp[i]) {
            trace(j);
            break;
        }
    }
    cout << i + 1 << " ";
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n; cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> k[i];

    int full = (1 << SEP) - 1, ans = 0, optPos = -1;
    for (int i = 0; i < n; i++) {
        // query part
        dp[i] = 1;
        for (int halfMask = 0; halfMask < (1 << SEP); halfMask++) {
            int curCount = __builtin_popcount(halfMask & a[i]), need = k[i] - curCount;
            if (0 <= need && need <= SEP)
                dp[i] = max(dp[i], bestMask[halfMask][a[i] >> SEP][need] + 1);
        }

        // update part
        for (int halfMask = 0; halfMask < (1 << SEP); halfMask++) {
            int curCount = __builtin_popcount((halfMask << SEP) & a[i]);
            bestMask[a[i] & full][halfMask][curCount] = max(bestMask[a[i] & full][halfMask][curCount], dp[i]);
        }

        if (dp[i] > ans) ans = dp[i], optPos = i;
    }
    cout << ans << "\n";
    trace(optPos);

    return 0;
}

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