Submission #1273847

#	Time	Username	Problem	Language	Result	Execution time	Memory
1273847		chanhchuong123	Longest beautiful sequence (IZhO17_subsequence)	C++20	100 / 100	2410 ms	169948 KiB

subsequence

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

const bool multiTest = false;
#define task "C"
#define fi first
#define se second
#define MASK(i) (1LL << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)

template<typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) a = b; else return 0; return 1;
}
template<typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) a = b; else return 0; return 1;
}

const int MAX = 100010;
int n;
int a[MAX];
int k[MAX];
int prv[MAX];
int cnt[1 << 10][1 << 10];
pair<int, int> dp[1 << 10][1 << 10][20];

void process(void) {
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    for (int i = 1; i <= n; ++i) cin >> k[i];

    for (int i = 0; i < (1 << 10); ++i) for (int j = 0; j < (1 << 10); ++j) {
        cnt[i][j] = __builtin_popcount(i & j);
    }

    int ans = 0, bestPos = 0;
    for (int i = 1; i <= n; ++i) {
        int l = a[i] >> 10, r = a[i] & ((1 << 10) - 1), cur = 1;

        for (int mask = 0; mask < (1 << 10); ++mask) {
            int numBit = k[i] - cnt[l][mask]; if (numBit < 0 || numBit > 10) continue;
            pair<int, int> &pp = dp[mask][r][numBit];
            if (maximize(cur, pp.fi + 1)) {
                if (pp.se > 0) prv[i] = pp.se;
            }
        }

        if (maximize(ans, cur)) {
            bestPos = i;
        }

        for (int mask = 0; mask < (1 << 10); ++mask) {
            pair<int, int> &pp = dp[l][mask][cnt[r][mask]];
            if (maximize(pp.fi, cur)) {
                pp.se = i;
            }
        }
    }

    cout << ans << '\n';

    vector<int> res;
    while (bestPos > 0) {
        res.push_back(bestPos);
        bestPos = prv[bestPos];
    }

    reverse(all(res));
    for (int &pos: res) cout << pos << ' ';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r",  stdin);
		freopen(task".out", "w", stdout);
	}

	int nTest = 1; if (multiTest) cin >> nTest;
	while (nTest--) {
		process();
	}

	return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:76:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |                 freopen(task".inp", "r",  stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:77:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |                 freopen(task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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