Submission #1105825

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105825		QuocSensei	Global Warming (CEOI18_glo)	C++14	100 / 100	169 ms	11960 KiB

glo

#include <bits/stdc++.h>

#define ll long long
#define el cout << '\n'

using namespace std;

const int maxn = 4e5;

int n, bitUp[maxn + 10], bitDown[maxn + 10], lis[maxn + 10], ans = 0;
vector<ll> v;
ll x, a[maxn + 10];

void updateUp(int x, int v)
{
    for (;x <= maxn; x += x&-x) bitUp[x] = max(bitUp[x], v);
}
int getUp(int x)
{
    int ans = 0;
    for (;x ; x&=x-1) ans = max(ans, bitUp[x]);
    return ans;
}
void updateDown(int x, int v)
{
    for (;x; x&=x-1) bitDown[x] = max(bitDown[x], v);
}
int getDown(int x)
{
    int ans = 0;
    for (;x <= maxn; x += x&-x) ans = max(ans, bitDown[x]);
    return ans;
}
ll f(ll x)
{
    return lower_bound(v.begin(), v.end(), x) - v.begin() + 1;
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen("GLO.INP", "r"))
    {
        freopen("GLO.INP", "r", stdin);
        freopen("GLO.OUT", "w", stdout);
    }
    cin >> n >> x;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        v.push_back(a[i]);
        v.push_back(a[i] + x);
    }
    sort(v.begin(), v.end());
    v.resize(unique(v.begin(), v.end()) - v.begin());
    for (int i = n; i >= 1; i--)
    {
        int p = getDown(f(a[i]) + 1) + 1;
        lis[i] = p;
        updateDown(f(a[i]), p);
    }
    for (int i = 1; i <= n; i++)
    {
        int p = getUp(f(a[i] + x) - 1) + 1;
        int u = getUp(f(a[i]) - 1) + 1;
        ans = max(ans, p + lis[i] - 1);
        updateUp(f(a[i]), u);
    }
    cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:44:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |         freopen("GLO.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen("GLO.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25