Submission #346865

#	Time	Username	Problem	Language	Result	Execution time	Memory
346865		impetus_	Gift (IZhO18_nicegift)	C++14	0 / 100	2078 ms	16152 KiB

nicegift

#include <bits/stdc++.h>
 
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define ll long long
#define int ll
#define forn(i, a, b) for(int i = (a); i <= (b); ++i)
#define forev(i, b, a) for(int i = (b); i >= (a); --i)
#define VAR(v, i) __typeof( i) v=(i)
#define forit(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define file(s) freopen(s".in","r",stdin); freopen(s".out","w",stdout);
 
using namespace std;
 
const int maxn = (int)1e6 + 10;
const int mod = (int)1e9 + 7;
const int P = (int) 1e6 + 7; 
const double pi = acos(-1.0);
 
#define inf mod
                        
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;   
typedef vector<ll> Vll;               
typedef vector<pair<int, int> > vpii;
typedef vector<pair<ll, ll> > vpll;                        
typedef array<int, 3> triple;
 
int n, k, sum, mx;
pii a[maxn];
 
inline void solve(){
  scanf("%lld%lld", &n, &k);
  forn(i, 1, n) {
    scanf("%lld", &a[i].f);
    a[i].s = i;
    sum += a[i].f;
    mx = max(mx, a[i].f);
  }
  if(sum % k || sum / k < mx){
    puts("-1");
    return;
  } 
  vector<pair<int, vi> > path;
  while(1){
    sort(a + 1, a + n + 1);
    reverse(a + 1, a + n + 1);
    if(!a[1].f) break;
    int l = 1, r = (int)1e18, res = -1;
    while(l <= r){
      int mid = (l + r) >> 1;
      int curS = sum - mid * mid, mx = max(a[k + 1].f, a[1].f - mid);
      if(curS / k >= mx){
        res = mid;
        l = mid + 1;
      }else
        r = mid - 1;
    }
    assert(res != -1);
    vi cur;
    forn(i, 1, k) a[i].f -= res, cur.pb(a[i].s);
    sum -= res * k;
    path.pb({res, cur});
  }
  printf("%lld\n", sz(path));
  for(auto x : path){
    printf("%lld ", x.f);
    for(auto it : x.s) printf("%lld ", it);
    puts("");
  }
}
main () {       
  int t = 1;
  //scanf("%d", &t);
  while(t--)
    solve();
}           

Compilation message (stderr)

nicegift.cpp:78:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   78 | main () {
      |       ^
nicegift.cpp: In function 'void solve()':
nicegift.cpp:39:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |   scanf("%lld%lld", &n, &k);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~
nicegift.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |     scanf("%lld", &a[i].f);
      |     ~~~~~^~~~~~~~~~~~~~~~~

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