Submission #1091528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091528		stdfloat	Global Warming (CEOI18_glo)	C++17	Compilation error	0 ms	0 KiB

glo

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define all(v) (v).begin(), v.end()

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n, x;
	cin >> n >> x;

	vector<int> a(n);
	for (auto &i : a)
		cin >> i;

	if (!x) {
		vector<int> v;
		for (int i = 0; i < n; i++) {
			if (v.empty() || v.back() < a[j]) v.push_back(a[j]);
			else v[lower_bound(all(v), a[j]) - v.begin()] = a[j];
		}

		return cout << (int)v.size(), 0;
	}

	int ans = 0;
	vector<int> v1, v2;
	for (int i = 0; i < n; i++) {
		vector<int> u1 = v1, u2 = v2;
		for (int j = i; j < n; j++) {
			a[j] += x;
			if (u1.empty() || u1.back() < a[j]) u1.push_back(a[j]);
			else u1[lower_bound(all(u1), a[j]) - u1.begin()] = a[j];

			a[j] -= x;
			if (u2.empty() || u2.back() < a[j]) u2.push_back(a[j]);
			else u2[lower_bound(all(u2), a[j]) - u2.begin()] = a[j];
		}

		ans = max({ans, (int)u1.size(), (int)u2.size()});

		if (v1.empty() || v1.back() < a[i]) v1.push_back(a[i]);
		else v1[lower_bound(all(v1), a[i]) - v1.begin()] = a[i];

		a[i] -= x;
		if (v2.empty() || v2.back() < a[i]) v2.push_back(a[i]);
		else v2[lower_bound(all(v2), a[i]) - v2.begin()] = a[i];
	}

	cout << ans << '\n';
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:21:34: error: 'j' was not declared in this scope
   21 |    if (v.empty() || v.back() < a[j]) v.push_back(a[j]);
      |                                  ^