Submission #1128053

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128053		BilAktauAlmansur	Bootfall (IZhO17_bootfall)	C++20	44 / 100	1087 ms	11036 KiB

bootfall

#include <bits/stdc++.h>
// #pragma optimize("g", on)
// #pragma GCC optimize ("inline")
// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC optimize ("03")
// #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
void Freopen () {
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
}
using namespace std;
#define fi first
#define se second
// #define int long long
const int N = 250000 + 7, M = 250000;

int n, a[N];
bitset<M> dp[507];
void knapsack(vector<int> v, int bs) {
	dp[bs][0] = 1;
	for(auto j : v) {
		dp[bs] |= (dp[bs] << j);
	}
}
void solve() {
	cin>>n;
	vector<int> vec;
	for(int i = 1; i <= n; i++) {
		cin>>a[i];
		vec.push_back(a[i]);
	}
	int need = accumulate(a + 1, a + 1 + n, 0ll);
	if(need % 2 == 1) {
		cout << "0\n";
		return;
	}
	need /= 2;
	knapsack(vec, 0);
	if(!dp[0][need]) {
		cout << "0\n";
		return;
	}
	for(int i = 1; i <= n; i++) {
		vector<int> vec;
		for(int j = 1; j <= n; j++) {
			if(i != j)vec.push_back(a[j]);
		}
		knapsack(vec, i);
	}
	vector<int> ans;
	for(int i = 1; i <= M; i++) {
		bool an = 1;
		for(int j = 1; j <= n; j++) {
			int W = need * 2 + i - a[j];
			if(W % 2 == 1) {
				an = 0;
				break;
			}
			if(!dp[j][W / 2] || !dp[j][W / 2 - i]) {
				an = 0;
				break;
			}
		}
		if(an)ans.push_back(i);
	}
	cout << ans.size() << '\n';
	for(auto j : ans)cout << j << ' ';
	cout << '\n';
}
signed main() {
	// freopen("duty.in", "r", stdin);
	// freopen("duty.out", "w", stdout);
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	//Freopen();
	int T = 1;
	// cin>>T;
	while(T --)solve();
}
/*
please AC

*/

Compilation message (stderr)

bootfall.cpp: In function 'void Freopen()':
bootfall.cpp:10:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:11:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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