Submission #1060489

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060489		Jarif_Rahman	Gift (IZhO18_nicegift)	C++17	30 / 100	841 ms	231524 KiB

nicegift

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, k; cin >> n >> k;
    vector<ll> A(n);
    for(ll &x: A) cin >> x;
    vector<pair<ll, vector<int>>> ans;

    priority_queue<pair<ll, int>> pq;
    for(int i = 0; i < n; i++) pq.push({A[i], i});

    ll sum = 0;
    for(ll x: A) sum+=x;
    if(sum%k != 0 || *max_element(A.begin(), A.end()) > sum/k){
        cout << "-1\n";
        exit(0);
    }

    while(pq.size() >= k){
        vector<int> cur;
        for(int i = 0; i < k; i++) cur.push_back(pq.top().second), pq.pop();
        ll lim = 0;
        if(!pq.empty()) lim = pq.top().first-1;
        ll mn = 1e18+5;
        for(int x: cur) mn = min(mn, A[x]-lim);
        for(int x: cur) A[x]-=mn;
        ans.push_back({mn, cur});
        if(ans.size() > int(3e6)){
            cout << "-1\n";
            exit(0);
        }
        for(int x: cur) if(A[x]) pq.push({A[x], x});
    }

    if(pq.size() != 0){
        cout << "-1\n";
        exit(0);
    }
    cout << ans.size() << "\n";
    for(auto [x, v]: ans){
        cout << x << " ";
        for(int i: v) cout << i+1 << " ";
        cout << "\n";
    }
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:23:21: warning: comparison of integer expressions of different signedness: 'std::priority_queue<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   23 |     while(pq.size() >= k){
      |           ~~~~~~~~~~^~~~

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