Submission #335173

#	Time	Username	Problem	Language	Result	Execution time	Memory
335173		amunduzbaev	Gift (IZhO18_nicegift)	C++14	0 / 100	556 ms	238264 KiB

nicegift

#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long 
#define ld long double 
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define prc(n) fixed << setprecision(n)
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pi acos(-1);
const ll inf = 1e18+7;
const int N = 1e6+5;

vector<pair<ll, ll>>v[N];
vector<ll>ans[N]; 
ll a[N];

void solve(){
	ll n, k, mx, sum;
	scanf("%lld %lld", &n, &k);
	for(int i=0; i<n; i++){
		scanf("%lld", &a[i]);
		mx = max(a[i], mx);
		sum += a[i];
	}
	if(mx * k > sum || sum % k){
		cout<<-1;
		return;
	}		
	
	ll c = 0, cnt = 0;
	ll size = sum/k;
	
	for(int i=0; i<n; i++){
		if(c + a[i] >= size){
			ll x = c + a[i] - size;
			v[cnt++].pb({a[i] - x, i + 1});
			c = x;
			v[cnt].pb({c, i + 1});
        }
		else{
			c += a[i];
			v[cnt].pb({a[i], i+1});
		}
	}
	bool f = 1;
	cnt = 0;
	while(f){
		f = 0;
		ll mn = inf;
		for(int i = 0; i < k; i++)  mn = min(mn, v[i].back().ff);
		ans[cnt].pb(mn);
		for(int i = 0; i < k; i++){
			pll x = v[i].back();
			v[i].pop_back();
			x.ff -= mn;
			ans[cnt].pb(x.ss);
			if(x.ff > 0) v[i].pb(x);
		}
		f |= (!v[0].empty());
		cnt++;
	}
	printf("%lld\n", cnt);
	for(int i = 0; i < cnt; i++){
		for(int j = 0; j < sz(ans[i]); j++){
			printf("%lld ", ans[i][j]);
		}printf("\n");
	}
	return;
}

/*

4 2
2 3 3 2

*/

int main(){
	int t = 1;
	//cin>>t;
	while(t--) solve();
	return 0;
}

Compilation message (stderr)

nicegift.cpp: In function 'void solve()':
nicegift.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |  scanf("%lld %lld", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~
nicegift.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |   scanf("%lld", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~~~
nicegift.cpp:34:8: warning: 'mx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |  if(mx * k > sum || sum % k){
      |     ~~~^~~
nicegift.cpp:27:15: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |  ll n, k, mx, sum;
      |               ^~~

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