Submission #482853

#	Time	Username	Problem	Language	Result	Execution time	Memory
482853		levsog2004	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	204 KiB

segments

#include <iostream>
#include <iomanip>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <cmath>
#include <list>
#include <set>
#include <map>
using namespace std;
#define all(a) a.begin(), a.end()
typedef long long ll;
const ll N = 2000004;
const ll mod = 1000 * 1000 * 1000 + 7;
const ll inf = 1000000000;
ll n, m, k, z, t, x, y, a[N],ans[N],idx[N];
int main()
{
	cin >> n;
	for (int i = 1; i <= n; ++i)
	{
		cin >> a[i];
		a[i] += a[i - 1];
	}
	for (int i = 1; i <= n; ++i)
	{
		idx[i] = max(idx[i], idx[i - 1]);
		ans[i] = ans[idx[i]] + 1;
		int id = lower_bound(a + 1, a + n + 1, 2 * a[i] - a[idx[i]]) - a;
		if (id <= n)
			idx[id] = max(idx[id],ll(i));
	}
	cout << ans[N];
	return 0;
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:38:15: warning: array subscript 2000004 is above array bounds of 'll [2000004]' {aka 'long long int [2000004]'} [-Warray-bounds]
   38 |  cout << ans[N];
      |               ^
segments.cpp:21:30: note: while referencing 'ans'
   21 | ll n, m, k, z, t, x, y, a[N],ans[N],idx[N];
      |                              ^~~

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