Submission #385603

#	Time	Username	Problem	Language	Result	Execution time	Memory
385603		patrikpavic2	Gift (IZhO18_nicegift)	C++17	100 / 100	1253 ms	94620 KiB

nicegift

#include <cstdio>
#include <cstring>
#include <vector>
#include <algorithm>
#include <set>

#define X first
#define Y second
#define PB push_back

using namespace std;

const int N = 2e6 + 500;

typedef long long ll;

int n, k; 
ll sm, A[N];
vector < pair < ll, int >  > swp;
vector < ll > kv;

int main(){	
	scanf("%d%d", &n, &k);
	for(int i = 1;i <= n;i++){
		scanf("%lld", A + i);
		sm += A[i];
	}
	if(sm % k != 0){
		printf("-1\n");
		return 0;
	}
	ll cik = (ll)sm / k;
	for(int i = 1;i <= n;i++){
		if(A[i] > cik){
			printf("-1\n");
			return 0;
		}
	}
	ll cur = 0;
	for(int i = 1;i <= n;i++){
		if(cur + A[i] <= cik){
			if(cur + A[i] < cik) 
				swp.PB({cur + A[i], -i});
			swp.PB({cur, i}); kv.PB(cur);
			cur = (cur + A[i]) % cik;
		}
		else{
			swp.PB({cur, i}); kv.PB(cur);
			swp.PB({0, i}); kv.PB(0);
			swp.PB({A[i] - (cik - cur), -i});
			cur = A[i] - (cik - cur);
		}
	}
	sort(kv.begin(), kv.end());
	kv.erase(unique(kv.begin(), kv.end()), kv.end());
	printf("%d\n", (int)kv.size());
	set < int > S;
	sort(swp.begin(), swp.end());
	for(int i = 0;i < (int)swp.size();){
		int j = i;
		while(i < (int)swp.size() && swp[i].X == swp[j].X){
			if(swp[i].Y > 0) S.insert(swp[i].Y);
			else 		     S.erase(-swp[i].Y);
			i++;
		}
		ll len = (i == (int)swp.size() ? cik : swp[i].X) - swp[j].X;
		printf("%lld ", len);
		for(int x : S)
			printf("%d ", x);
		printf("\n");
	}
	return 0;
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
nicegift.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |   scanf("%lld", A + i);
      |   ~~~~~^~~~~~~~~~~~~~~

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