Submission #290449

#	Time	Username	Problem	Language	Result	Execution time	Memory
290449		luciocf	Bigger segments (IZhO19_segments)	C++14	0 / 100	0 ms	256 KiB

segments

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxn = 5e5+10;

int n;
int a[maxn];

int qtd(int p)
{
	ll ant = 0;

	for (int i = 1; i <= p; i++)
		ant += 1ll*a[i];

	int at = p;
	int ans = 1;

	while (at < n)
	{
		++ans;
		ll aux = 0;

		int i;
		for (i = at+1; i <= n; i++)
		{
			aux += 1ll*a[i];

			if (aux >= ant) break;
		}

		if (i > n) return -1;

		at = i;
		ant = aux;
	}

	return ans;
}

int main(void)
{
	scanf("%d", &n);

	ll soma = 0;

	for (int i = 1; i <= n; i++)
	{
		scanf("%d", &a[i]);
		soma += 1ll*a[i];
	}

	int ini = 1, fim = 1, ans = 1;

	ll aux = 0;
	for (int i = n; i >= 1; i--)
	{
		aux += 1ll*a[i];

		if (soma-aux <= aux)
		{
			fim = i;
			break;
		}
	}

	while (ini <= fim)
	{
		int mid = (ini+fim)>>1;

		if (qtd(mid) != -1) fim = mid-1, ans = qtd(mid);
		else ini = mid+1; 
	}

	printf("%d\n", ans);
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
segments.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27