Submission #168506

#	Time	Username	Problem	Language	Result	Execution time	Memory
168506		achibasadzishvili	Gift (IZhO18_nicegift)	C++14	49 / 100	2067 ms	105568 KiB

nicegift

#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pb push_back
#define mp make_pair
using namespace std;
ll n,k,a[2000005],s,las,p,cur,maxi,l,r,mid,can,ans1;
set<pair<ll,int> >st;
vector<vector<ll> >ans;
ll g[4000005],sz=0,wsz;
int main(){
    ios::sync_with_stdio(0);
  cin>>n>>k;
  bool ok = 1;
    for(int i=1; i<=n; i++){
        cin>>a[i];
       if(a[i] != a[1])ok = 0;
        s += a[i];
        st.insert(mp(-a[i] , i));
    }
 
    if(s % k){
        cout << "-1";
        return 0;
    }
 
    ll raod = s / k;
    ll sum = s;
    ll ra = 0;
    while(sum){
    	if(ra > 2000000){
    		cout << "-1";
    		return 0;
    	}
        if((int)st.size() < k){
            cout << "-1";
            return 0;
        }
        p = 0,cur = 0;
        maxi = -(*st.begin()).f;
        for(set<pair<ll,int> >::iterator it = st.begin(); it != st.end(); it++){
            p++;
            if(p > k){
                cur = (*it).s;
                break;
            }
            las = (*it).s;
        }
       // l = 1 , r = a[las] , mid , can = -1;
        ll x1 = a[las];
        if(k > 1)x1 = (sum - maxi) / (k - 1);
        can = (sum - a[cur] * k) / k;
        if(can > x1)can = x1;
        if(can > a[las])can = a[las];
        if(can <= 0){
        	cout << "-1";
        	return 0;
        }
        sum -= can * k;
        ra += k;
        p = 0;
        ans1++;
        g[sz] = can;sz++;
        wsz=sz;
        for(set<pair<ll,int> >::iterator it = st.begin(); it != st.end(); it++){
            p++;
            if(p > k){
                cur = (*it).s;
                break;
            }
            g[sz] = ((*it).s);
            sz++;
        }
        for(int i=wsz; i<sz; i++){
            st.erase(mp(-a[g[i]] , g[i]));
            a[g[i]]-=can;
            if(a[g[i]])st.insert(mp(-a[g[i]] , g[i]));
        }
    }

    cout<<ans1<<"\n";
 
    for(int i=0; i<sz; i++)
		cout << g[i] << " ";
 
    return 0;
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:15:8: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   bool ok = 1;
        ^~
nicegift.cpp:28:8: warning: unused variable 'raod' [-Wunused-variable]
     ll raod = s / k;
        ^~~~

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