Submission #651942

#	Time	Username	Problem	Language	Result	Execution time	Memory
651942		vovik	Gift (IZhO18_nicegift)	C++17	100 / 100	1120 ms	108400 KiB

nicegift

//I wrote this code 4 u today
#include <bits/stdc++.h>
 
#define vc vector
 
#define nd node*
#define pnd pair<nd, nd>
 
using namespace std;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll, ll> pll;
typedef vc<pll> vpll;
typedef vc<vll> vvll;
typedef vc<vpll> vvpll;
 
template<const ll MOD>
struct mod_mul : std::multiplies<const ll> {
    ll operator()(const ll a, const ll b) {
        return (a * b) % MOD;
    }
};
 
 
template<typename T>
inline void sort(T &a) {
    sort(a.begin(), a.end());
}
 
template<typename T>
inline void unique(T &a) {
    a.resize(unique(a.begin(), a.end()) - a.begin());
}
 
template<typename T>
inline void reverse(T &a) {
    reverse(a.begin(), a.end());
}
 
const ll INF = 9023372036854775808ll;
const ll MOD = 1000000007ll;
 
#define int ll
 
int32_t main() {
    cin.tie(nullptr)->ios_base::sync_with_stdio(false);
    int n, k;
    cin >> n >> k;
    vc<ll> a(n);
    ll sm = 0, mx = 0;
    for (auto &i : a) cin >> i, sm += i, mx = max(mx, i);
    if (sm % k || mx > sm / k) return cout << "-1\n", 0;
    priority_queue<pair<int, int>> alive;
    for (int i = 0; i < n; ++i) if (a[i]) alive.emplace(a[i], i);
    vc<vc<int>> ans;
    while (!alive.empty()) {
        vc<int> inds(k);
        for (int i = k - 1; i >= 0; --i) inds[i] = alive.top().second, alive.pop();
        if (!a[inds.back()]) break;
        int d = min(sm / k - (alive.empty() ? 0 : alive.top().first), a[inds[0]]);
        ans.push_back({d});
        for (auto i : inds) ans.back().push_back(i + 1), a[i] -= d, alive.emplace(a[i], i);
        sm -= k * d;
    }
    cout << ans.size() << '\n';
    for (auto v : ans) {
        for (auto &i : v) cout << i << ' ';
        cout << '\n';
    }
}

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