Submission #367612

#	Time	Username	Problem	Language	Result	Execution time	Memory
367612		nicolaalexandra	Gift (IZhO18_nicegift)	C++14	49 / 100	2039 ms	116292 KiB

nicegift

#include <bits/stdc++.h>
#define DIM 1000010
using namespace std;

set <pair<long long,int> > s;
vector <pair<long long,int> > w;
vector <long long> sol[DIM];
long long v[DIM];
int n,k,i,el;

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n>>k;
    long long sum = 0;
    for (i=1;i<=n;i++){
        cin>>v[i];
        s.insert(make_pair(v[i],i));
        sum += v[i];
    }

    if (sum % k){
        cout<<-1;
        return 0;
    }

    long long cnt = sum / k;

    while (!s.empty()){
        if (s.size() < k){
            cout<<-1;
            return 0;
        }

        int pas = 0; long long val = 0, val2 = 0;
        w.clear();

        for (set <pair<long long,int> > :: reverse_iterator it = s.rbegin(); it != s.rend(); it++){
            //sol[el].push_back(it->second);
            pas++;
            if (pas == k+1){
                val2 = it->first;
                break;
            }
            w.push_back(make_pair(it->first,it->second));
            val = it->first;
        }

        val = min (val,cnt - val2);
        sol[++el].push_back (val);
        cnt -= val;

        for (auto it : w){
            long long x = it.first; int poz = it.second;
            sol[el].push_back(poz);
            s.erase(make_pair(x,poz));
            if (x > val)
                s.insert(make_pair(x-val,poz));
        }
    }

    cout<<el<<"\n";
    for (i=1;i<=el;i++){
        for (auto it : sol[i])
            cout<<it<<" ";
        cout<<"\n";
    }


    return 0;
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:32:22: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |         if (s.size() < k){
      |             ~~~~~~~~~^~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 0 / 51