Submission #678396

#	Time	Username	Problem	Language	Result	Execution time	Memory
678396		Ahmed57	Bootfall (IZhO17_bootfall)	C++14	65 / 100	1094 ms	3600 KiB

bootfall

#include <bits/stdc++.h>

using namespace std;
long long dp[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;
    int 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 = sum;j>=arr[i];j--){
            dp[j]+=dp[j-arr[i]];
            if(dp[j]>=1e18)dp[j]%=mod;
        }
    }
    if(sum%2||(!dp[sum/2])){
        cout<<"0";
        return 0;
    }
    vector<int> v;
    for(int i = (arr[0]%2?1:2);i<=sum;i+=2){v.push_back(i);}
    for(int it = 0;it<n;it++){
        for(int j = arr[it];j<=sum;j++){
            dp[j]-=dp[j-arr[it]];
            dp[j]%=mod;
            if(dp[j]<0){dp[j]%=mod;dp[j]+=mod;dp[j]%=mod;}
        }
        vector<int> c;
        for(auto j:v){
            if((sum-arr[it]+j)%2){
                continue;
            }
            int ne = sum-arr[it]+j;
            int d = 0;
            if(ne/2<=sum)d = (dp[ne/2]>0);
            else break;
            if(j<=ne/2&&(ne/2)-j<=sum)d|=(dp[(ne/2)-j]>0);
            if(d==1)c.push_back(j);
        }
        v = c;
        for(int j = sum;j>=arr[it];j--){
            dp[j]+=dp[j-arr[it]];
            if(dp[j]>=1e18)dp[j]%=mod;
        }
    }
    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: 21 / 21
• Subtask 6: 0 / 35