Submission #1128103

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128103		BilAktauAlmansur	Bootfall (IZhO17_bootfall)	C++17	100 / 100	602 ms	2636 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;

short int n, a[507];
int us[N];
signed main() {
	// freopen("duty.in", "r", stdin);
	// freopen("duty.out", "w", stdout);
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	// cout.tie(NULL);
	//Freopen();
	cin>>n;
	for(short int i = 1; i <= n; i++) {
		cin>>a[i];
	}
	sort(a + 1, a + 1 + n);
	int need = accumulate(a + 1, a + 1 + n, 0);
	for(int i = 1; i <= need; i++)us[i] = 1;
	if(need % 2 == 1) {
		cout << "0\n";
		return 0 ;
	}
	need /= 2;
	bitset<M> st;
	st[0] = 1;
	for(int i = 1; i <= n; i++)st |= (st << a[i]);
	if(!st[need]) {
		cout << "0\n";
		return 0;
	}
	st.reset();
	need *= 2;
	st[0] = 1;
	for(int j = 1; j <= n; j++) {
		bitset<M> ts = st;
		for(int i = j + 1; i <= n; i++)ts |= (ts << a[i]);
		int s = 1;
		if(a[1] % 2 == 0)s ++;
		for(int i = s; i <= need; i += 2) {
			if(!us[i])continue;
			int W = need + i - a[j];
			if(W % 2 == 1) {
				us[i] = 0;
				continue;
			}
			if(!ts[W / 2])us[i] = 0;
		}
		st |= (st << a[j]);
	}
	vector<int> ans;
	int s = 1;
	if(a[1] % 2 == 0)s ++;
	for(int i = s; i <= need; i += 2)if(us[i])ans.push_back(i);
	cout << ans.size() << '\n';
	for(auto j : ans)cout << j << ' ';
	cout << '\n';
}
/*
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: 21 / 21
• Subtask 6: 35 / 35