Submission #346814

#	Time	Username	Problem	Language	Result	Execution time	Memory
346814		acm	Bootfall (IZhO17_bootfall)	C++14	100 / 100	369 ms	2156 KiB

bootfall

#include <bits/stdc++.h>
#define speed                   \
  ios_base::sync_with_stdio(0); \
  cin.tie(0);                   \
  cout.tie(0);
#define precision     \
  cout.precision(30); \
  cerr.precision(10);
#define ll long long
#define ld long double
#define pll pair<ll, ll>
#define pii pair<int, int>
#define forn(n) for (int i = 1; i <= n; i++)
#define forlr(l, r) for (int i = l; i != r; (l > r ? i-- : i++))
#define pb(x) push_back(x)
#define sz(x) (int)x.size()
#define mp(x, y) make_pair(x, y)
#define all(x) x.begin(), x.end()
#define pc(x) __builtin_popcount(x)
#define pcll(x) __builtin_popcountll(x)
#define F first
#define S second
using namespace std;
int n, m, s, a[505], dp[250005];
bitset<250005> w;
void add(int x) {
  s += x;
  for (int i = s - x; i >= 0; i--) dp[i + x] += dp[i];
}
void del(int x) {
  for (int i = x; i <= s; i++) dp[i] -= dp[i - x];
  s -= x;
}
int main() {
  speed;
  precision;
  // code
  cin >> n;
  dp[0] = 1;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    add(a[i]);
  }
  if (s % 2 || !dp[s / 2]) {
    cout << 0;
    return 0;
  }
  for (int i = 0; i <= 250000; i++) w[i] = 1;
  m = s;
  for (int i = 1; i <= n; i++) {
    del(a[i]);
    m = min(m, s);
    for (int j = 0; j <= s; j++)
      if ((s - j) % 2 || !dp[(s - j) / 2]) w[j] = 0;
    add(a[i]);
  }
  for (int i = m + 1; i <= 250000; i++) w[i] = 0;
  cout << w.count() << "\n";
  for (int i = 1; i <= 250000; i++)
    if (w[i]) cout << i << " ";
      // endl
#ifndef ONLINE_JUDGE
  cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 21 / 21
• Subtask 6: 35 / 35