Submission #1008659

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008659		m5588ohammed	Bootfall (IZhO17_bootfall)	C++14	13 / 100	1 ms	348 KiB

bootfall

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#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define int long long
#define mod 1000000007
const int S=2501;
int sum[S+2],fre[S+2],t,New[S+1];
void inc(int x){
    memset(New,0,sizeof New);
    for(int j=x;j<=S;j++) New[j]=sum[j-x];
    for(int j=1;j<=S;j++){
        sum[j]+=New[j];
        sum[j]%=mod;
    }
    sum[x]++;
    sum[x]%=mod;
    return;
}
void dec(int x){
    sum[x]--;
    for(int j=1;j<=S-x;j++){
        sum[j+x]-=sum[j];
        sum[j+x]+=mod;
        sum[j+x]%=mod;
    }
    return;
}
signed main()
{
    int n;
    cin>>n;
    int arr[n];
    for(int i=0;i<n;i++){
        cin>>arr[i];
        inc(arr[i]);
        t+=arr[i];
    }
    if(sum[t/2]==0){cout<<0<<endl;return 0;}
    for(int i=0;i<n;i++){
        dec(arr[i]);
        t-=arr[i];
        for(int j=0;j<=S;j++) {
            if((t-j)-j>0&&(j==0||sum[j]>0)&&sum[(t-j)]>0) fre[(t-j)-j]++;
        }
        t+=arr[i];
        inc(arr[i]);
    }
    int siz=0;
    for(int j=1;j<=S;j++){
        if(fre[j]==n) siz++;
    }
    cout<<siz<<endl;
    for(int j=1;j<=S;j++){
        if(fre[j]==n) cout<<j<<" ";
    }
    return 0;
}

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