Submission #502597

#	Time	Username	Problem	Language	Result	Execution time	Memory
502597		lukameladze	Gift (IZhO18_nicegift)	C++14	7 / 100	2078 ms	19396 KiB

nicegift

#include <bits/stdc++.h>
#define f first
#define s second
#define int long long
#define pb push_back
#define pii pair <int, int>
using namespace std;
const int N = 3e5 + 5;
int n,k,a[N],mx,cur,sum,le,ri,mid,sum1,mx1,mn,anss;
vector < pii > v;
vector <int> ans[N];
int pas[N];
main() {
  	std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>n>>k;
    for (int i = 1; i <= n; i++) {
        cin>>a[i];
        mx = max(mx,a[i]);
        sum += a[i];
    }
    if (mx > sum / k || sum % k) {
        cout<<"-1"<<endl;
        return 0;
    }
    while (true) {
        v.clear();
        int sum1 = 0;
        mx = 0;
        for (int i = 1; i <= n; i++) {
            if (a[i] != 0) v.pb({a[i],i});
            mx = max(mx,a[i]);
            sum1 += a[i];
        }
        if (v.size() == 0) break;
        sort(v.begin(),v.end());
        reverse(v.begin(),v.end());
        if (v.size() > k) mx1 = v[k].f;
        else mx1 = 0;
        mx = v[0].f; mn = v[k - 1].f;
        le = 1;
        ri = 1e5;
        while(le <= ri) {
            mid = (le + ri) / 2;
            if (mn < mid || max(mx1,mx-mid)>(sum1 - k*mid)/k) {
                ri = mid - 1;
            } else {
                anss = mid;
                le = mid + 1;
            }
        }
        cur++;
        pas[cur] = anss;
        for (int i = 0; i < k; i++) {
            a[v[i].s] -= anss;
            ans[cur].pb(v[i].s);
        }
    }
    cout<<cur<<"\n";
    for (int i = 1; i <= cur; i++) {
        cout<<pas[i]<<" ";
        for (int j = 0; j < ans[i].size(); j++) {
            cout<<ans[i][j]<<" ";
        }cout<<"\n";
    }
}

Compilation message (stderr)

nicegift.cpp:13:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   13 | main() {
      | ^~~~
nicegift.cpp: In function 'int main()':
nicegift.cpp:37:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   37 |         if (v.size() > k) mx1 = v[k].f;
      |             ~~~~~~~~~^~~
nicegift.cpp:61:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for (int j = 0; j < ans[i].size(); j++) {
      |                         ~~^~~~~~~~~~~~~~~

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