# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1096974 | ducdev | Global Warming (CEOI18_glo) | C++14 | 2062 ms | 7764 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// Author: 4uckd3v - Nguyen Cao Duc
#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
typedef long long ll;
const int MAX_N = 1e6;
const int MOD = 1e9 + 7;
int n;
ll a[MAX_N + 5], x;
struct FenwickTree {
vector<int> bit;
int n;
void update(int pos, int val) {
for (; pos <= n; pos += pos & (-pos))
bit[pos] = max(bit[pos], val);
};
int get(int pos) {
int ret = 0;
for (; pos > 0; pos -= pos & (-pos))
ret = max(ret, bit[pos]);
return ret;
};
FenwickTree(int n) : n(n) {
bit.assign(n + 5, 0);
};
};
namespace SUBTASK_1 {
const int N = MAX_N;
int dp[N + 5][4];
void Solve() {
int res = 0;
for (int i = 1; i <= n; i++) {
for (int j = 0; j < 4; j++) dp[i][j] = 1;
for (int j = 1; j < i; j++) {
if (a[i] + x > a[j]) {
dp[i][1] = max(dp[i][1], dp[j][0] + 1);
};
if (a[i] - x > a[j]) {
dp[i][2] = max(dp[i][2], dp[j][0] + 1);
};
if (a[i] > a[j]) {
dp[i][0] = max(dp[i][0], dp[j][0] + 1);
dp[i][1] = max(dp[i][1], dp[j][1] + 1);
dp[i][2] = max(dp[i][2], dp[j][2] + 1);
};
if (a[i] > a[j] + x) {
dp[i][3] = max(dp[i][3], dp[j][1] + 1);
};
if (a[i] > a[j] - x) {
dp[i][4] = max(dp[i][4], dp[j][2] + 1);
};
}
res = max({res, dp[i][0], dp[i][1], dp[i][2], dp[i][3], dp[i][4]});
}
cout << res << '\n';
};
}; // namespace SUBTASK_1
namespace SUBTASK_2 {
const int N = MAX_N;
ll c[N + 5];
void Solve() {
vector<ll> v;
for (int i = 1; i <= n; i++) c[i] = a[i];
for (int i = 1; i <= n; i++) v.push_back(c[i]);
sort(all(v));
v.resize(unique(all(v)) - v.begin());
for (int i = 1; i <= n; i++) {
c[i] = lower_bound(all(v), c[i]) - v.begin() + 1;
};
FenwickTree bit(n);
int res = 0;
for (int i = 1; i <= n; i++) {
int dp = bit.get(c[i] - 1);
bit.update(c[i], dp + 1);
res = max(res, dp + 1);
}
cout << res << '\n';
};
}; // namespace SUBTASK_2
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
if (fopen("MAIN.INP", "r")) {
freopen("MAIN.INP", "r", stdin);
freopen("MAIN.OUT", "w", stdout);
};
cin >> n >> x;
for (int i = 1; i <= n; i++) {
cin >> a[i];
};
if (x == 0)
return SUBTASK_2::Solve(), 0;
return SUBTASK_1::Solve(), 0;
};
Compilation message (stderr)
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