Submission #678373

#	Time	Username	Problem	Language	Result	Execution time	Memory
678373		Ahmed57	Bootfall (IZhO17_bootfall)	C++14	44 / 100	1085 ms	2428 KiB

bootfall

#include <bits/stdc++.h>

using namespace std;
long long dp[2*500*500+1];
long long mod = int(1e9+7);
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    long long arr[n] , sum = 0;
    for(int i = 0;i<n;i++){
        cin>>arr[i];sum+=arr[i];
    }
    dp[0] = 1;
    for(int i = 0;i<n;i++){
        for(int j = 2*sum;j>=arr[i];j--){
            dp[j]+=dp[j-arr[i]];
            dp[j]%=mod;
        }
    }
    if(sum%2||(!dp[sum/2])){
        cout<<"0";
        return 0;
    }
    int su[sum+1];
    for(int i = 1;i<=sum;i++)su[i] = 1;
    for(int it = 0;it<n;it++){
        for(int j = arr[it];j<=2*sum;j++){
            dp[j]-=dp[j-arr[it]];
            dp[j]%=mod;dp[j]+=mod;dp[j]%=mod;
        }
        for(int j = 1;j<=sum;j++){
            if((sum-arr[it]+j)%2){
                su[j]=0;
            }
            int ne = sum-arr[it]+j;
            int d = (dp[ne/2]>0);
            if(j<=ne/2)d|=(dp[(ne/2)-j]>0);
            su[j]&=d;
        }
        for(int j = 2*sum;j>=arr[it];j--){
            dp[j]+=dp[j-arr[it]];
            dp[j]%=mod;
        }
    }
    vector<int> v;
    for(int i = 1;i<=sum;i++){
        if(su[i])v.push_back(i);
    }
    cout<<v.size()<<"\n";
    for(auto i:v)cout<<i<<" ";
}

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