Submission #566461

#	Time	Username	Problem	Language	Result	Execution time	Memory
566461		dxz05	Global Warming (CEOI18_glo)	C++14	100 / 100	600 ms	25776 KiB

glo

//#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
//#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 1248;

struct SegTree{
    vector<int> tree;
    int size = 1;

    SegTree(int n){
        size = n;
        tree.assign(4 * n + 5, 0);
    }

    void update(int v, int tl, int tr, int pos, int val, bool flag){
        if (tl == tr){
            if (flag) tree[v] = max(tree[v], val); else
                tree[v] = val;
            return;
        }
        int tm = (tl + tr) >> 1;
        if (pos <= tm) update(v << 1, tl, tm, pos, val, flag); else
            update(v << 1 | 1, tm + 1, tr, pos, val, flag);
        tree[v] = max(tree[v << 1], tree[v << 1 | 1]);
    }

    void update(int pos, int val, bool flag){
        update(1, 0, size - 1, pos, val, flag);
    }

    int get(int v, int tl, int tr, int l, int r){
        if (l <= tl && tr <= r) return tree[v];
        if (tl > r || tr < l) return 0;
        int tm = (tl + tr) >> 1;
        return max(get(v << 1, tl, tm, l, r), get(v << 1 | 1, tm + 1, tr, l, r));
    }

    int get(int l, int r){
        return get(1, 0, size - 1, l, r);
    }

};

void solve(int TC) {
    int n, lim;
    cin >> n >> lim;

    vector<int> a(n);
    for (int i = 0; i < n; i++){
        cin >> a[i];
    }

    map<int, int> mp;
    for (int i : a) mp[i] = 0;

    int foo = 0;
    for (auto &now : mp) now.second = ++foo;

    SegTree st1(n), st2(n);

    vector<int> dp1(n, 0), dp2(n, 0);
    for (int i = 0; i < n; i++){
        int x = mp[a[i]];
        dp1[i] = st1.get(0, x - 1) + 1;
        st1.update(x, dp1[i], true);
    }

    for (int i = n - 1; i >= 0; i--){
        int x = mp[a[i]];
        dp2[i] = st2.get(x + 1, n - 1) + 1;
        st2.update(x, dp2[i], true);
    }

    vector<pair<int, int>> b;
    for (int i = 0; i < n; i++) b.emplace_back(a[i], i);

    sort(all(b));

    vector<int> pos(n);
    for (int i = 0; i < n; i++) pos[b[i].second] = i;

    SegTree st(n);
    for (int i = 0; i < n; i++) st.update(pos[i], dp2[i], false);

    int ans = 0;
    for (int i = 0; i < n; i++){
        st.update(pos[i], 0, false);

        int p = upper_bound(all(b), MP(a[i] - lim, INF)) - b.begin();

        if (p < n){
            int val = st.get(p, n - 1);
            ans = max(ans, dp1[i] + val);
        }

    }

    cout << ans << endl;

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

#ifdef dddxxz
    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;
#endif

    return 0;
}

• 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