Submission #438144

#	Time	Username	Problem	Language	Result	Execution time	Memory
438144		lulwpop	Bootfall (IZhO17_bootfall)	C++14	0 / 100	5 ms	716 KiB

bootfall

#include <bits/stdc++.h>
#define all(X) X.begin(), X.end()
#define sz(x) (int)x.size()
#define fr first
#define sc second
#define endl '\n'

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

const int maxn = 1e6 + 10;
const int maxa = 1e6;
const int inf = 2e9;
const ll INF = 1e18;
const ll mod = 1e9 + 7;
const int block = 350;

int main () 
{
	ios_base::sync_with_stdio(0); cin.tie();
/*#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#else*/
	freopen("bootfall.in", "r", stdin);
	freopen("bootfall.out", "w", stdout);
//#endif
	int n; cin >> n;
	vector <int> a (n);
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	bitset <25100> st;
	int sum = 0;
	st[0] = 1;
	for (int i = 0; i < n; i++) {
		st |= (st << a[i]);
		sum += a[i];
	}
	if (!(sum & 1) && !st[sum >> 1]) {
		cout << 0;
		return 0;
	}
	vector <int> ans;
	for (int ins = 1; ins <= 25000; ins++) {
		bool ok = true;
		for (int i = 0; i < n; i++) {
			st = 0;
			st[0] = 1;
			sum = 0;
			for (int j = 0; j < n; j++) {
				if (i != j) {
					st |= (st << a[j]);
					sum += a[j];
				}
			}
			st |= (st << ins);
			sum += ins;
			if ((sum & 1)) {
				ok = false;
				break;
			}
			else if (!st[sum >> 1]) {
				ok = false;
				break;
			}
		}
		if (ok) {
			ans.push_back(ins);
		} 
	}
	cout << sz(ans) << endl;
	for (auto i : ans) {
		cout << i << " ";
	}
	return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:29:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |  freopen("bootfall.in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:30:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |  freopen("bootfall.out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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