Submission #502630

#	Time	Username	Problem	Language	Result	Execution time	Memory
502630		lukameladze	Gift (IZhO18_nicegift)	C++14	30 / 100	127 ms	57532 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,cnt;
vector < pii > v;
vector <int> ans[N];
vector < pii > v1;
int pas[N];
set <pii > :: iterator it;
set < pii > ms;
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];
        ms.insert({a[i],i});
    }
    if (mx > sum / k || sum % k) {
        cout<<"-1"<<endl;
        return 0;
    }
    int ss = 0;
    sum1 = sum;
    while (true) {
        v.clear();v1.clear();
        mx = mx1 = 0;
        if (ms.size() == 0) break;
        mn = 1e9;
    	   it = ms.end();
    	   cnt = 0;
        while (true) {
            it--;
            cnt++;
            if (cnt <= k) {
                mx = max(mx,(*it).f);
                mn = min(mn,(*it).f);
            }
            if (cnt == k + 1) {
                mx1 = (*it).f;
                break;
            }
            if (it == ms.begin()) break;
        }
        le = 1;
        ri = 1e18;
        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++) {
        	it = ms.end();
            it--;
            int x = (*it).f; int y = (*it).s;
            a[y] -= anss;sum1 -= anss;
            v1.pb({x - anss, y});
            ans[cur].pb(y);
			ms.erase(it);
        }
        for (int i = 0; i < v1.size(); i++) {
        	if (v1[i].f != 0)
            ms.insert({v1[i].f,v1[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:16:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   16 | main() {
      | ^~~~
nicegift.cpp: In function 'int main()':
nicegift.cpp:73:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |         for (int i = 0; i < v1.size(); i++) {
      |                         ~~^~~~~~~~~~~
nicegift.cpp:81:27: 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]
   81 |         for (int j = 0; j < ans[i].size(); j++) {
      |                         ~~^~~~~~~~~~~~~~~
nicegift.cpp:29:9: warning: unused variable 'ss' [-Wunused-variable]
   29 |     int ss = 0;
      |         ^~

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