Submission #1263585

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263585		Bui_Quoc_Cuong	Bootfall (IZhO17_bootfall)	C++20	65 / 100	1035 ms	4668 KiB

bootfall

#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=a;i<=(int)b;i++)
#define FORD(i,a,b) for(int i=a;i>=(int)b;i--)
#define fi first
#define se second
#define pb push_back
#define ALL(A) A.begin(), A.end()
#define BIT(mask,i) ((mask>>(i))&1)
#define ll long long
using namespace std;
template <class A, class B> bool maximize(A &a, const B b) {if(a<b){a = b;return 1;} return 0;}
template <class A, class B> bool minimize(A &a, const B b) {if(a>b){a = b;return 1;} return 0;}
int n;
int a[505];
void init()
{
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
}
bitset <500 * 505> dp, f[505];
void process()
{
    int S = 0;
    FOR(i, 1, n) S+= a[i];
    if(S & 1) return void(cout << 0);
    dp[0] = 1;
    FOR(i, 1, n)
    {
        dp |= dp << a[i];
    }
    if(dp[S / 2] == 0) return void(cout << 0);
    sort(a + 1, a + 1 + n);
    FOR(i, 1, n)
    {
        dp.reset();
        dp[0] = 1;
        FOR(j, 1, n) if(i != j) dp |= dp << a[j];
        FOR(j, 0, S) if(dp[j] == 0) f[i][j] = 1;
    }
    vector <int> ans;
    FOR(i, 0, S - a[n])
    {
        ans.push_back(i);
        FOR(j, 1, n)
        {
            int sum = S - a[j] + i;
            if(sum & 1)
            {
                ans.pop_back();
                break;
            }
            if(f[j].test(sum >> 1) && ((sum >> 1) < i || f[j].test((sum >> 1) - i)))
            {
                ans.pop_back();
                break;
            }
        }
    }
    cout << ans.size() << '\n';
    for(int &val : ans) cout << val << " ";
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #define Hori "concacs"
    if(fopen(Hori".inp", "r"))
    {
        freopen(Hori".inp", "r", stdin);
        freopen(Hori".out", "w", stdout);
    }
    init();
    process();
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(Hori".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(Hori".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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