Submission #893246

#	Time	Username	Problem	Language	Result	Execution time	Memory
893246		vjudge1	Gift (IZhO18_nicegift)	C++17	49 / 100	558 ms	524288 KiB

nicegift

// 以上帝的名义
// 候选硕士
#include <bits/stdc++.h>

#ifdef local
#include "algo/debug.h"
#else
#define dbg(x...) 0
#endif

using namespace std ;
using ll = long long ;

#define int ll

int32_t main() {
    cin.tie(0)->sync_with_stdio(false) ;
    ll n , k ; cin >> n >> k ;
    vector<ll> a(n) ;
    for (ll &i : a) cin >> i ;
    priority_queue<pair<ll,ll>> q ;
    for (int i = 0 ; i < n ; i++) {
        q.push({a[i], i}) ;
    }
    ll sum = accumulate(a.begin(), a.end(), 0ll) ;
    if (sum % k || (q.size() && (sum / k) < q.top().first)) {
        cout << -1 << "\n" ;
        return 0 ;
    }
    vector<deque<ll>> res ;
    while (q.size() >= k) {
        deque<ll> cur ;
        ll mn = LLONG_MAX ;
        for (int i = 0 ; i < k ; i++) {
            auto [value, ind] = q.top() ;
            q.pop() ;
            cur.push_back(ind) ;
            mn = value ;
        }
        if (q.size()) mn = min(mn * 1ll, (sum / k) - q.top().first) ;
        assert(mn >= 0) ;
        sum -= k * mn ;
        for (ll& i : cur) {
            a[i] -= mn ;
            if (a[i]> 0) {
                q.push({a[i], i}) ;
            }
            i++ ;
        }
        cur.push_front(mn) ;
        res.push_back(cur) ;
    }
    if (q.size()) {
        cout << -1 ;
        return 0 ;
    }
    reverse(res.begin(), res.end()) ;
    cout << res.size() << "\n" ;
    for (auto i : res) {
        for (int j : i) cout << j << ' ' ;
        cout << "\n" ;
    }
    return 0 ;
}

// 希望白银

Compilation message (stderr)

nicegift.cpp: In function 'int32_t main()':
nicegift.cpp:31:21: warning: comparison of integer expressions of different signedness: 'std::priority_queue<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   31 |     while (q.size() >= k) {
      |            ~~~~~~~~~^~~~

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