Submission #443146

#	Time	Username	Problem	Language	Result	Execution time	Memory
443146		Abrar_Al_Samit	Drvca (COCI19_drvca)	C++17	110 / 110	245 ms	6852 KiB

drvca

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
    
using namespace std;
using namespace __gnu_pbds;
    
    
#define debug(x) cerr << '[' << (#x) << "] = " << x << '\n';
    
template<class T> using ordered_set = tree<T, null_type , less<T> , rb_tree_tag , tree_order_statistics_node_update> ;
    
void PlayGround() {
    int N; cin >> N;
    vector<int>a(N);
    for(int i=0; i<N; ++i) cin >> a[i];
    sort(a.begin(), a.end());
    
    if(N < 4) {
        cout << 1 << '\n' << a[0] << '\n' << N-1 << '\n';
        for(int i=1; i<N; ++i) cout << a[i] << ' ';
        cout << '\n';
        return;
    }
    auto print = [] (vector<int>&x, vector<int>&y) {
        if(y.empty()) y.push_back(x.back()), x.pop_back();
        cout << x.size() << '\n';
        for(auto it : x) cout << it << ' ';
        cout << '\n';
        cout << y.size() << '\n';
        for(auto it : y) cout << it << ' ';
        cout << "\n";
    };
    auto msTomp = [] (multiset<int>&ms, map<int,int>&mp) {
        auto it = ms.begin();
        auto it2 = it;
        ++it2;
        while(it2!=ms.end()) {
            mp[*it2-*it]++;
            ++it2, ++it;
        }
    };
    auto insertNew = [] (multiset<int>::iterator it, multiset<int>&ms, map<int,int>&mp) {
        if(it!=ms.begin() && next(it, 1)!=ms.end()) {
            int gap = *next(it, 1) - *prev(it, 1);
            mp[gap]--;
            if(mp[gap]==0) mp.erase(gap);
            mp[*it - *prev(it, 1)]++;
            mp[*next(it, 1) - *it]++;
        } else if(it!=ms.begin()) {
            mp[*it-*prev(it, 1)]++;
        } else if(next(it, 1)!=ms.end()) {
            mp[*next(it, 1)-*it]++;
        }
    };
    vector<int>b = {0, 1, 2};
    do {
        vector<int>x = {a[b[0]], a[b[1]]}, y;
        if(x[0]>x[1]) swap(x[0], x[1]);
        int dif = x[1] - x[0];
    
        multiset<int>ms;
        map<int,int>mp;
        ms.insert(a[b[2]]);
        for(int i=3; i<N; ++i) {
            if(a[i]-x.back()==dif) x.push_back(a[i]);
            else ms.insert(a[i]);
        }
        if(ms.empty()) {
            print(x, y);
            return;
        }
        msTomp(ms, mp);
        for(int i=x.size(); i>0; --i) {
            if(i<x.size()) {
                ms.insert(x[i]);
                insertNew(ms.find(x[i]), ms, mp);
            }
            if(mp.size()<2) {
                for(auto it : ms) y.push_back(it);
                x.resize(i);
                print(x, y);
                return;
            }
        }
    } while(next_permutation(b.begin(), b.end()));
    vector<int>x = {a[0], a[1], a[2]}, y;
    if(x[2]-x[1]!=x[1]-x[0]) {
        cout << -1 << '\n';
        return;
    }
    multiset<int>ms;
    map<int,int>mp;
    for(int i=3; i<N; ++i) {
        if(a[i]-x.back()==x[1]-x[0]) x.push_back(a[i]);
        else ms.insert(a[i]);
    }
    if(ms.empty()) {
        print(x, y);
        return;
    }
    msTomp(ms, mp);
    
    for(int i=x.size(); i>0; --i) {
        if(i<x.size()) {
            ms.insert(x[i]);
            insertNew(ms.find(x[i]), ms, mp);
        }
        if(mp.size()<2) {
            for(auto it : ms) y.push_back(it);
            x.resize(i);
            print(x, y);
            return;
        }
    }
    cout << -1 << '\n';
    
    
    #ifndef ONLINE_JUDGE
        cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
    #endif
}   
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
  //  #ifndef ONLINE_JUDGE
 //       freopen("input.txt", "r", stdin);
//    #endif
    PlayGround();
    
    return 0;
}

Compilation message (stderr)

drvca.cpp: In function 'void PlayGround()':
drvca.cpp:75:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |             if(i<x.size()) {
      |                ~^~~~~~~~~
drvca.cpp:105:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |         if(i<x.size()) {
      |            ~^~~~~~~~~

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