Submission #35294

#	Time	Username	Problem	Language	Result	Execution time	Memory
35294		dqhungdl	Bootfall (IZhO17_bootfall)	C++14	65 / 100	1000 ms	4820 KiB

bootfall

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

const int mod=1e9+7;
int n,sum,a[505],C[250005],f[250005];
vector<int> rs;

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

void Check(int pos)
{
    for(int i=a[pos];i<=sum;i++)
        f[i]=(f[i]-f[i-a[pos]]+mod)%mod;
    for(int i=0;i<(sum-a[pos]+1)/2;i++)
        if(f[i]>0)
            C[sum-a[pos]-2*i]++;
    for(int i=sum;i>=a[pos];i--)
        f[i]=(f[i]+f[i-a[pos]])%mod;
}

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:50:18: 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: 16 / 16
• Subtask 5: 21 / 21
• Subtask 6: 0 / 35