Submission #93833

#	Time	Username	Problem	Language	Result	Execution time	Memory
93833		dalgerok	Bootfall (IZhO17_bootfall)	C++14	100 / 100	359 ms	4204 KiB

bootfall

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



const int N = 505, M = 1e7 + 5, MOD = 1e9 + 9;



int n, a[N], sum, ssum;
bool used[M];
long long dp[M];


inline void Add(int val){
    sum += val;
    for(int i = sum; i >= 0; i--){
        dp[i + val] += dp[i];
    }
}
inline void Del(int val){
    for(int i = 0; i <= sum; i++){
        dp[i + val] -= dp[i];
    }
    sum -= val;
}

main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    dp[0] = 1;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        ssum += a[i];
        Add(a[i]);
    }
    for(int i = 1; i <= ssum; i++){
        used[i] = true;
    }
    if(ssum % 2 || dp[ssum / 2] == 0){
        return cout << 0, 0;
    }
    for(int i = 1; i <= n; i++){
        Del(a[i]);
        for(int j = 1; j <= ssum; j++){
            if((sum + j) % 2 || dp[(sum + j) / 2] == 0){
                used[j] = false;
            }
        }
        Add(a[i]);
    }
    vector < int > ans;
    for(int i = 1; i <= ssum; i++){
        if(used[i]){
            ans.push_back(i);
        }
    }
    cout << (int)ans.size() << "\n";
    for(auto it : ans){
        cout << it << " ";
    }
}

Compilation message (stderr)

bootfall.cpp:29:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

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