Submission #586735

#	Time	Username	Problem	Language	Result	Execution time	Memory
586735		Shin	Bootfall (IZhO17_bootfall)	C++14	0 / 100	1 ms	324 KiB

bootfall

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define all(x) x.begin(), x.end()

using namespace std;
template <class X, class Y> bool minimize(X &a, Y b) {
    if (a > b) return a = b, true;
    return false;
}
template <class X, class Y> bool maximize(X &a, Y b) {
    if (a < b) return a = b, true;
    return false;
}

const int N = 500 + 500 + 7;
int n;
int sum;
int a[N];
int cnt[N];

void solve(int l, int r, bitset<N> &dp) {
  if (l == r) {
    for (int i = 0; i < N; i ++) {
      int cur = sum - a[l] - i * 2;
      if (cur >= 0) {
        cnt[cur] += dp[i];
      }
    }
    return;
  }
  int mid = (l + r) >> 1;
  bitset<N> tmp = dp;
  for (int i = l; i <= mid; i ++) {
    tmp |= (tmp << a[i]);
  }
  solve(mid + 1, r, tmp);
  for (int i = mid + 1; i <= r; i ++) {
    dp |= (dp << a[i]);
  }
  solve(l, mid, dp);
}

signed main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n;
  for (int i = 1; i <= n; i ++) {
    cin >> a[i];
  }
  sum = accumulate(a + 1, a + n + 1, 0);
  bitset<N> dp;
  dp[0] = 1;
  for (int i = 1; i <= n; i ++) {
    dp |= (dp << a[i]);
  }
  if ((sum & 1) || !dp[sum / 2]) {
    return cout << 0, 0;
  }
  dp.reset();
  dp[0] = 1;
  solve(1, n, dp);
  vector<int> res;
  for (int j = 0; j < N; j ++) {
    if (cnt[j] == n) {
      res.push_back(j);
    }
  }
  cout << (int) res.size() << '\n';
  for (int x: res) {
    cout << x << ' ';
  }
  return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35