Submission #169400

#	Time	Username	Problem	Language	Result	Execution time	Memory
169400		RafaelSus	Gift (IZhO18_nicegift)	C++14	7 / 100	2067 ms	515716 KiB

nicegift

#include <bits/stdc++.h>
 
using namespace std;
const int N = 1e6 + 5;
typedef long long ll;
const ll inf=1e18+18ll;
#define pb push_back
 
ll n,k;
ll a[N];
/*
void build(int v,int tl,int tr){
  if(tl==tr)t[v]=a[tl],return;
  int tm=(tl+tr)/2;
  build(v+v,tl,tm);
  build(v+v+1,tm+1,tr);
  t[v]=min(t[v+v],t[v+v+1]);
}

void pushdown(int v){
  if(lazy[v]==0)return;
  t[v+v]-=lazy[v];
  t[v+v+1]-=lazy[v];
  lazy[v+v]+=lazy[v];
  lazy[v+v+1]+=lazy[v];
  lazy[v]=0;
}

void update(int v,int tl,int tr,int l,int r,ll d){
  if(l>r)return;
  if(tl>=l&&tr<=r){
    lazy[v]+=d;
    t[v]-=d;
    return;
  }
  pushdown(v);
  int tm=(tl+tr)/2;
  if(l<=tm)update(v+v,tl,tm,l,r,d);
  if(r>tm)update(v+v+1,tm+1,tr,l,r,d);
  t[v]=min(t[v+v],t[v+v+1]);
}

ll query(int v,int tl,int tr,int l,int r){
  if(tl>=l&&tr<=r)return t[v];
  ll res=inf;
  int tm=(tl+tr)/2;
  pushdown(v);
  if(l<=tm)res=min(res,query(v+v,tl,tm,l,r));
  if(r>tm)res=min(res,query(v+v+1,tm+1,tr,l,r));
  return res;
}*/

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  ll S=0ll;
  cin>>n>>k;
  priority_queue<pair<ll,int>> q;
  for(int i=0;i<n;i++){
    cin>>a[i];
    q.push({a[i],i});
    S+=a[i];
  }
  if(S%k||q.top().first>S/k){cout<<"-1\n";return 0;}
  S/=k;
  vector<vector<int>> answ;
  ll cnt=0ll;
  while(!q.empty()){
    pair<ll,int>tmp[k];
    //if(q.size()<k){cout<<"-1\n";return 0;}
    for(int i=0;i<k;i++){
      tmp[i]=q.top();
      q.pop();
    }
    vector<int> an;
    ll mx=q.size()?q.top().first:0ll;
    ll x=min(tmp[k-1].first,S-mx);
    an.push_back(x);
    for(int i=0;i<k;i++){
      tmp[i].first-=x;
      if(tmp[i].first!=0)q.push(tmp[i]);
      an.push_back(tmp[i].second+1);
    }
    cnt+=(ll)an.size();
    //if(cnt>=3*1e6){cout<<"-1";return 0;}
    answ.push_back(an);
  }
  cout<<answ.size()<<'\n';
  for(int i=0;i<answ.size();i++){
    for(int j=0;j<answ[i].size();j++){
      cout<<answ[i][j]<<' ';
    }
    cout<<'\n';
  }
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:89:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<answ.size();i++){
               ~^~~~~~~~~~~~
nicegift.cpp:90:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<answ[i].size();j++){
                 ~^~~~~~~~~~~~~~~

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