Submission #1225634

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225634		fermat	Gift (IZhO18_nicegift)	C++20	100 / 100	389 ms	135720 KiB

nicegift

#include <bits/stdc++.h>

#define pb emplace_back
#define mk make_pair
#define fr first
#define sc second

using namespace std;

const int N = 1e6 + 5;

int n, k, sz, l[N];

long long sum, ar[N], mx, cn, mn[N];

vector < pair <long long, int> > vec[N];

vector < vector <int> > ans;

main()
{
 cin >> n >> k;
 for (int i = 1; i <= n; i++)
  scanf("%lld", &ar[i]), sum += ar[i], mx = max(mx, ar[i]);
  
 if (mx > sum / k || sum % k != 0){
  puts("-1");
  return 0;
 }
 sum /= k;
 for (int i = 1; i <= n; i++)
 {
  if (cn + ar[i] > sum){
   
   vec[sz].pb( make_pair(sum - cn, i) );
   ar[i] -= (sum - cn);
   i--;
   cn = 0;
   sz++;
  }
  else{
   cn += ar[i];
   vec[sz].pb( make_pair(ar[i], i) );
  }
  if (cn == sum){
   cn = 0;
   sz++;
  }
 }
 assert(sz == k);
 
 while (1)
 {
  ans.pb( vector <int>() );
  
  mn[ans.size()] = 2e18;
  
  for (int j = 0; j < sz; j++)
   mn[ans.size()] = min(vec[j][ l[j] ].fr, mn[ans.size()]);
  
  for (int j = 0; j < sz; j++)
  {
   ans.back().pb( vec[j][ l[j] ].sc );
   
   vec[j][ l[j] ].fr -= mn[ ans.size() ];
   
   if (vec[j][ l[j] ].fr == 0)
    l[j]++;
  }
  if (l[0] >= (int)vec[0].size() ) break;
 }
 cn = 0;
 cout << ans.size() << endl;
 for (auto it : ans)
 {
  printf("%lld ", mn[ cn + 1 ]);
  for (auto to : it)
   printf("%d ", to);
   
  puts("");
  cn++;
 }
}
/**
4 2
2 3 3 2
**/

Compilation message (stderr)

nicegift.cpp:20:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   20 | main()
      | ^~~~
nicegift.cpp: In function 'int main()':
nicegift.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   scanf("%lld", &ar[i]), sum += ar[i], mx = max(mx, ar[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~

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