Submission #1257606

#	Time	Username	Problem	Language	Result	Execution time	Memory
1257606		knhatdev	Drvca (COCI19_drvca)	C++20	110 / 110	181 ms	12104 KiB

drvca

#include<bits/stdc++.h>
#define int long long
#define ii pair<int,int>
#define fi first
#define se second
#define task "noel"
using namespace std;

const int N = 1e6 + 5, mod = 1e9 + 7;
int n, a[N];

void check1()
{
    int d = a[2] - a[1];
    vector<int> v;
    multiset<int> val, dis;
    v.push_back(a[1]);
    v.push_back(a[2]);
    int trc = -1;
    for(int i = 1; i <= n; i++)
    {
        if(i == 1 || i == 2) continue;
        val.insert(a[i]);
        if(trc != -1) dis.insert(a[i] - trc);
        trc = a[i];
    }
    if(val.size() == 1 || (*dis.begin() == *dis.rbegin()))
    {
        cout << v.size() << '\n';
        for(int x : v) cout << x << ' ';
        cout << '\n';
        cout << val.size() << '\n';
        for(int x : val) cout << x << ' ';
        exit(0);
    }

    for(int i = 3; i <= n; i++)
    {
        int x = v.back() + d;
        if(val.find(x) != val.end())
        {
            v.push_back(x);
            val.erase(val.find(x));
            auto tmp = val.lower_bound(x);
            auto tmp2 = val.lower_bound(x);
            if(tmp != val.end())
                dis.erase(dis.find(*tmp - x));
            if(tmp2 != val.begin())
            {
                --tmp2;
                dis.erase(dis.find(x - *tmp2));
                if(tmp != val.end())
                    dis.insert(*tmp - *tmp2);
            }
        }
        else
        {
            return;
        }
        if(val.size() == 1 || (*dis.begin() == *dis.rbegin()))
        {
            cout << v.size() << '\n';
            for(int x : v) cout << x << ' ';
            cout << '\n';
            cout << val.size() << '\n';
            for(int x : val) cout << x << ' ';
            exit(0);
        }
    }
}

void check2()
{
    int d = a[3] - a[1];
    vector<int> v;
    multiset<int> val, dis;
    v.push_back(a[1]);
    v.push_back(a[3]);
    int trc = -1;
    for(int i = 1; i <= n; i++)
    {
        if(i == 1 || i == 3) continue;
        val.insert(a[i]);
        if(trc != -1) dis.insert(a[i] - trc);
        trc = a[i];
    }
    if(val.size() == 1 || (*dis.begin() == *dis.rbegin()))
    {
        cout << v.size() << '\n';
        for(int x : v) cout << x << ' ';
        cout << '\n';
        cout << val.size() << '\n';
        for(int x : val) cout << x << ' ';
        exit(0);
    }

    for(int i = 3; i <= n; i++)
    {
        int x = v.back() + d;
        if(val.find(x) != val.end())
        {
            v.push_back(x);
            val.erase(val.find(x));
            auto tmp = val.lower_bound(x);
            auto tmp2 = val.lower_bound(x);
            if(tmp != val.end())
                dis.erase(dis.find(*tmp - x));
            if(tmp2 != val.begin())
            {
                --tmp2;
                dis.erase(dis.find(x - *tmp2));
                if(tmp != val.end())
                    dis.insert(*tmp - *tmp2);
            }
        }
        else
        {
            return;
        }
        if(val.size() == 1 || (*dis.begin() == *dis.rbegin()))
        {
            cout << v.size() << '\n';
            for(int x : v) cout << x << ' ';
            cout << '\n';
            cout << val.size() << '\n';
            for(int x : val) cout << x << ' ';
            exit(0);
        }
    }
}

void check3()
{
    int d = a[3] - a[2];
    vector<int> v;
    multiset<int> val, dis;
    v.push_back(a[2]);
    v.push_back(a[3]);
    int trc = -1;
    for(int i = 1; i <= n; i++)
    {
        if(i == 2 || i == 3) continue;
        val.insert(a[i]);
        if(trc != -1) dis.insert(a[i] - trc);
        trc = a[i];
    }
    for(int i = 3; i <= n; i++)
    {
        int x = v.back() + d;
        if(val.find(x) != val.end())
        {
            v.push_back(x);
            val.erase(val.find(x));
            auto tmp = val.lower_bound(x);
            auto tmp2 = val.lower_bound(x);
            if(tmp != val.end())
                dis.erase(dis.find(*tmp - x));
            if(tmp2 != val.begin())
            {
                --tmp2;
                dis.erase(dis.find(x - *tmp2));
                if(tmp != val.end())
                    dis.insert(*tmp - *tmp2);
            }
        }
        else
        {
            return;
        }
        if(val.size() == 1 || (*dis.begin() == *dis.rbegin()))
        {
            cout << v.size() << '\n';
            for(int x : v) cout << x << ' ';
            cout << '\n';
            cout << val.size() << '\n';
            for(int x : val) cout << x << ' ';
            exit(0);
        }
    }
}

main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if(fopen(task ".inp", "r")){
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> a[i];
    sort(a + 1, a + 1 + n);
    if(n == 2)
    {
        cout << 1 << '\n' << a[1] << '\n' << 1 << '\n' << a[2];
        exit(0);
    }
//    if(n <= 4)
//    {
//        cout << 2 << '\n';
//        for(int i = 1; i <= 2; i++)
//            cout << a[i] << ' ';
//        cout << '\n';
//        cout << n - 2 << '\n';
//        for(int i = 3; i <= n; i++)
//            cout << a[i] << ' ';
//        exit(0);
//    }
    check1();
    check2();
    check3();
    cout << -1 << '\n';
}

Compilation message (stderr)

drvca.cpp:182:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  182 | main(){
      | ^~~~
drvca.cpp: In function 'int main()':
drvca.cpp:185:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  185 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
drvca.cpp:186:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  186 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 30 / 30
• Subtask 4: 30 / 30