Submission #855108

#	Time	Username	Problem	Language	Result	Execution time	Memory
855108		Alfraganus	Bootfall (IZhO17_bootfall)	C++17	28 / 100	1064 ms	61276 KiB

bootfall

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

#define fs first
#define ss second
#define endl '\n'
#define all(a) a.begin(), a.end()

#define print(a)          \
    for(auto x : a)       \
        cout << x << ' '; \
    cout << endl;

#define printmp(a)   \
    for (auto x : a) \
        cout << x.fs << ' ' << x.ss << endl;

vector<vector<int>> dp;

void solve(){
    int n;
    cin >> n;
    vector<int> a(n);
    int sum = 0;
    bool even = false, odd = false;
    for(int i = 0; i < n; i ++)
        cin >> a[i], sum += a[i], even |= !(a[i] & 1), odd |= (a[i] & 1);
    sort(all(a));
    if((sum & 1)){
        cout << 0;
        return;
    }
    if(even and odd){
        cout << 0;
        return;
    }
    queue<int> q;
    q.push(sum / 2);
    bool flag = false;
    vector<bool> used(sum / 2);
    while(!q.empty()){
        int x = q.front();
        q.pop();

        if(x == 0)
            flag = 1;

        if(!flag){
            for(int i = 0; i < n; i ++){
                if(x >= a[i] and !used[x - a[i]]){
                    used[x - a[i]] = 1;
                    q.push(x - a[i]);
                }
            }
        }
    }
    if(!flag){
        cout << 0;
        return;
    }
    dp.resize(n, vector<int> (sum));
    for(int i = 0; i < n; i ++){
        dp[i][0] = 1;
        vector<int> b;
        for(int j = 0; j < n; j ++){
            if(i != j){
                dp[i][a[j]] = 1;
                for (auto x : b)
                {
                    if (x + a[j] < (int)dp[0].size() and dp[i][x + a[j]] == 0)
                    {
                        dp[i][x + a[j]] = 1;
                        b.push_back(x + a[j]);
                    }
                }
                b.push_back(a[j]);
            }
        }
        b.clear();
    }
    if(even){
        vector<int> ans;
        for(int j = 2; j <= sum - a[0]; j += 2){
            int c = sum;
            for(int i = 0; i < n; i ++){
                sum -= a[i];
                sum += j;
                if(!((sum / 2 < (int)dp[0].size() and sum / 2 >= 0 and dp[i][sum / 2] == 1) or (sum / 2 - j < (int)dp[0].size() and sum / 2 >= j and dp[i][sum / 2 - j] == 1)))
                    break;
                sum -= j;
                sum += a[i];
                if(i == n - 1)
                    ans.push_back(j);
            }
            sum = c;
        }
        cout << ans.size() << endl;
        print(ans)
    }
    else{
        vector<int> ans;
        for (int j = 1; j <= sum - a[0]; j += 2)
        {
            int c = sum;
            for (int i = 0; i < n; i++)
            {
                sum -= a[i];
                sum += j;
                if (!((sum / 2 < dp[0].size() and sum / 2 >= 0 and dp[i][sum / 2]) or (sum / 2 - j < dp[0].size() and sum / 2 >= j and dp[i][sum / 2 - j])))
                    break;
                sum -= j;
                sum += a[i];
                if (i == n - 1)
                    ans.push_back(j);
            }
            sum = c;
        }
        cout << ans.size() << endl;
        print(ans)
    }
}

signed main(){
    // ios::sync_with_stdio(0);
    // cin.tie(0);
    int t = 1;
    // cin >> t;
    while(t --){
        solve();
        cout << endl;
    }
}

Compilation message (stderr)

bootfall.cpp: In function 'void solve()':
bootfall.cpp:109:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |                 if (!((sum / 2 < dp[0].size() and sum / 2 >= 0 and dp[i][sum / 2]) or (sum / 2 - j < dp[0].size() and sum / 2 >= j and dp[i][sum / 2 - j])))
      |                        ~~~~~~~~^~~~~~~~~~~~~~
bootfall.cpp:109:100: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |                 if (!((sum / 2 < dp[0].size() and sum / 2 >= 0 and dp[i][sum / 2]) or (sum / 2 - j < dp[0].size() and sum / 2 >= j and dp[i][sum / 2 - j])))
      |                                                                                        ~~~~~~~~~~~~^~~~~~~~~~~~~~

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