Submission #726674

#	Time	Username	Problem	Language	Result	Execution time	Memory
726674		fdnfksd	Gift (IZhO18_nicegift)	C++14	49 / 100	265 ms	23752 KiB

nicegift

#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e6+10;
const ll inf=1e18;
const ll mod=1e9+7;
ll n,k,a[maxN];
void solve()
{
    cin >> n >> k;
    ll sum=0;
    for(int i=1;i<=n;i++)
    {
        cin >> a[i];
        sum+=a[i];
    }
    if(sum<=1e5)
    {
        priority_queue<pli> pq;
        for(int i=1;i<=n;i++) pq.push({a[i],i});
        vector<pli> vc;
        vc.resize(k);
        vector<vector<ll>> ans;
        while(pq.size()>=k)
        {
            vector<ll> vd;
            vd.pb(1);
            for(int i=0;i<k;i++)
            {
                vc[i]=pq.top();
                pq.pop();
                vc[i].fi--;
                vd.pb(vc[i].se);
            }
            sum-=k;
            ans.pb(vd);
            for(int i=0;i<k;i++)
            {
                if(vc[i].fi>0) pq.push(vc[i]);
            }
        }
        if(sum==0)
        {
            cout << ans.size()<<'\n';
            for(auto vec:ans)
            {
                for(auto zz:vec) cout << zz<<' ';
                cout << '\n';
            }
        }
        else cout << -1;
    }
    else
    {
        for(int i=1;i<n;i++)
        {
            if(a[i]!=a[i+1])
            {
                cout << -1;
                return;
            }
        }
        if(a[1]*n%k!=0) cout << -1;
        else
        {
            ll x=-1,y=-1;
            for(ll i=1;i<=k;i++)
            {
                if(k%i==0&&n%i==0&&a[1]%(k/i)==0)
                {
                    x=i;
                    y=k/i;
                }
            }
            if(x==-1) {cout << -1;return;}
            ll s=1;
            cout << n/x<<'\n';
            for(int i=1;i<=n/x;i++)
            {
                cout << a[1]/y<<' ';
                ll cnt=k;
                while(cnt--)
                {
                    cout << s<<' ';
                    s=s+1;
                    if(s>n) s-=n;
                }
                cout << '\n';
            }
        }
    }
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message (stderr)

nicegift.cpp: In function 'void solve()':
nicegift.cpp:30:24: warning: comparison of integer expressions of different signedness: 'std::priority_queue<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   30 |         while(pq.size()>=k)
      |               ~~~~~~~~~^~~

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