Submission #314909

#	Time	Username	Problem	Language	Result	Execution time	Memory
314909		dolphingarlic	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	7 ms	1792 KiB

subsequence

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

const int FM = (1 << 20) - 1, HM = (1 << 10) - 1;

int a[100001], k[100001];
pair<int, int> dp[1 << 10][1 << 10][11], ans[100001];

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) scanf("%d", a + i);
    for (int i = 1; i <= n; i++) {
        scanf("%d", k + i);
        pair<int, int> best = {0, 0};
        if (k[i] <= 10) {
            for (int j = 0; j < (1 << 10); j++) if (__builtin_popcount(a[i] & j) <= k[i])
                best = max(best, dp[j][a[i] >> 10][k[i] - __builtin_popcount(a[i] & j)]);
        } else {
            k[i] = 20 - k[i];
            for (int j = 0; j < (1 << 10); j++) if (10 - __builtin_popcount(a[i] & j) <= k[i])
                best = max(best, dp[j][a[i] >> 10][k[i] - 10 + __builtin_popcount(a[i] & j)]);
        }
        best.first++;
        ans[i] = best;
        for (int j = 0; j < (1 << 10); j++) {
            int cnt = __builtin_popcount((a[i] >> 10) & j);
            dp[a[i] & HM][j][cnt] = max(dp[a[i] & HM][j][cnt], {best.first, i});
        }
    }

    int best_idx = max_element(ans + 1, ans + n + 1) - ans;
    printf("%d\n", ans[best_idx].first);
    stack<int> seq;
    while (best_idx) {
        seq.push(best_idx);
        best_idx = ans[best_idx].second;
    }
    while (seq.size()) {
        printf("%d ", seq.top());
        seq.pop();
    }
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
subsequence.cpp:12:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |     for (int i = 1; i <= n; i++) scanf("%d", a + i);
      |                                  ~~~~~^~~~~~~~~~~~~
subsequence.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |         scanf("%d", k + i);
      |         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 60