Submission #35222

#	Time	Username	Problem	Language	Result	Execution time	Memory
35222		dqhungdl	Bootfall (IZhO17_bootfall)	C++14	28 / 100	1000 ms	3164 KiB

bootfall

#include <bits/stdc++.h>
using namespace std;

const int N=250005;
int n,sum,a[505],C[250005];
bitset<N> f;
vector<int> rs;

bool Special()
{
    if(sum%2==1)
        return false;
    f[0]=1;
    for(int i=1;i<=n;i++)
        f|=(f<<a[i]);
    return f[sum/2];
}

void Check(int pos)
{
    f.reset();
    f[0]=1;
    for(int i=1;i<=n;i++)
        if(i!=pos)
            f|=(f<<a[i]);
    for(int i=0;i<(sum-a[pos]+1)/2;i++)
        if(f[i]==1)
            C[sum-a[pos]-2*i]++;
}

int main()
{
    //freopen("TEST.INP","r",stdin);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        sum+=a[i];
    }
    if(Special()==false)
    {
        cout<<0;
        return 0;
    }
    for(int i=1;i<=n;i++)
        Check(i);
    for(int i=1;i<=sum;i++)
        if(C[i]==n)
            rs.push_back(i);
    cout<<rs.size()<<"\n";
    for(int i=0;i<rs.size();i++)
        cout<<rs[i]<<' ';
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:51:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<rs.size();i++)
                  ^

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