This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define bitcount(x) __builtin_popcountll(x)
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
#define ss(x) (int)x.size()
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
if (a > b)
{
a = b;
return true;
}
return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
if (a < b)
{
a = b;
return true;
}
return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
void add(int &x, int k)
{
x += k;
x %= mod;
if(x < 0) x += mod;
}
void del(int &x, int k)
{
x -= k;
x %= mod;
if(x < 0) x += mod;
}
const int nn = 250010;
int n,a[maxn];
bitset<nn> f,ans[505];
main()
{
#define name "TASK"
if (fopen(name ".inp", "r"))
{
freopen(name ".inp", "r", stdin);
freopen(name ".out", "w", stdout);
}
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
fo(i,1,n) cin >> a[i];
int tot = 0;
f[0] = 1;
fo(i,1,n)
{
f |= f << a[i];
tot += a[i];
}
if(tot % 2 == 1 or f[tot / 2] == 0) return cout << 0,0;
fo(j,1,tot) ans[n + 1][j] = 1;
fo(i,1,n)
{
fo(j,1,tot)
{
f = 0;
f[0] = 1;
a[n + 1] = j;
fo(k,1,n + 1) if(k != i)
{
f |= f << a[k];
}
int tot1 = tot - a[i] + a[n + 1];
if(tot1 % 2 == 0 and f[tot1 / 2] == 1) ans[i][j] = 1;
}
ans[n + 1] &= ans[i];
}
cout << ans[n + 1].count();en;
fo(j,1,tot) if(ans[n + 1][j]) cout << j << ' ';
}
Compilation message (stderr)
bootfall.cpp:58:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
58 | main()
| ^~~~
bootfall.cpp: In function 'int main()':
bootfall.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
63 | freopen(name ".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
64 | freopen(name ".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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