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Submission #35290

# Submission time Handle Problem Language Result Execution time Memory
35290 2017-11-19T16:10:56 Z dqhungdl Bootfall (IZhO17_bootfall) C++14
0 / 100
 0 ms 4948 KB 
#include <bits/stdc++.h>
using namespace std;

const int mod=1e9+7;
int n,sum,a[505],C[250005],f[250005],f2[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||f2[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);
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&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);
    printf("%d\n",int(rs.size()));
    for(int i=0;i<rs.size();i++)
        printf("%d",rs[i]);
}

Compilation message

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++)
                  ^
bootfall.cpp:33:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
bootfall.cpp:36:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4948 KB Output is correct
2 Incorrect 0 ms 4948 KB Output isn't correct
3 Halted 0 ms 0 KB -