Submission #484051

#	Time	Username	Problem	Language	Result	Execution time	Memory
484051		Killer2501	Global Warming (CEOI18_glo)	C++14	100 / 100	123 ms	22736 KiB

glo

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<ll, pll>
#define fi first
#define se second
using namespace std;
const int N = 2e5+15;
const int M = 550;
const ll mod = 998244353;
const ld base = 1e6;
const ll inf = 1e16;
const ld pi = acos(-1);
ll n, m, k, ans,  cnt[N], t, h[N], c[N], tong, lab[N], a[N], b[N];
vector<ll> adj[N];
string s[N];
mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
vector<ll> kq;
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n&1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
ll findp(ll u)
{
    return lab[u] < 0 ? u : lab[u] = findp(lab[u]);
}
void hop(ll u, ll v)
{
    if(lab[u] > lab[v])swap(u, v);
    lab[u] += lab[v];
    lab[v] = u;
    k = max(k, -lab[u]);
}
struct BIT
{
    ll n;
    vector<ll> fe;
    BIT(ll _n)
    {
        n = _n;
        fe.resize(n+1, 0);
    }
    void add(ll id, ll x)
    {
        for(; id <= n; id += id & -id)fe[id] = max(fe[id], x);
    }
    ll get(ll id)
    {
        ll total = 0;
        for(; id; id -= id & -id)total = max(total, fe[id]);
        return total;
    }
};

void sol()
{
    cin >> n >> k;
    for(int i = 1; i <= n; i ++)
    {
        cin >> a[i];
        kq.pb(a[i]);
    }
    ans = 0;
    sort(kq.begin(), kq.end());
    kq.erase(unique(kq.begin(), kq.end()), kq.end());
    BIT l(n), r(n);
    for(int i = 1; i <= n; i ++)
    {
        b[i] = lower_bound(kq.begin(), kq.end(), a[i]+k) - kq.begin() + 1;
        a[i] = lower_bound(kq.begin(), kq.end(), a[i]) - kq.begin() + 1;
        c[i] = l.get(a[i]-1);
        m = max(l.get(b[i]-1), r.get(a[i]-1));
        l.add(a[i], c[i]+1);
        r.add(a[i], m+1);
    }
    cout << r.get(n);
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "tests"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:95:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:96:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |   freopen(task".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