Submission #933999

#	Time	Username	Problem	Language	Result	Execution time	Memory
933999		Amirreza_Fakhri	Global Warming (CEOI18_glo)	C++17	100 / 100	1905 ms	134440 KiB

glo

// In the name of the God
#include <bits/stdc++.h>
#define ll long long
#define int long long
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define pii pair <int, int>
#define smin(x, y) (x) = min((x), (y))
#define smax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(), (x).end()
using namespace std;

const int inf = 3e9+7;
const int mod = 998244353;
const int maxn = 2e5+5;

int n, x, a[maxn], dp[maxn];
multiset <int> fen[maxn];
vector <int> vec1, vec2;

void upd(int i, int x, int t) {
    for (i++; i <= vec1.size(); i += i&(-i)) {
        if (t == 1) fen[i-1].insert(x);
        else fen[i-1].erase(fen[i-1].find(x));
    }
}

int get(int i) {
    int ans = 0;
    for (i++; i; i -= i&(-i)) {
        if (fen[i-1].size()) smax(ans, *fen[i-1].rbegin());
    }
    return ans;
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> x;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        vec1.pb(a[i]);
    }
    a[n] = inf; vec1.pb(inf);
    sort(all(vec1)); vec1.resize(unique(all(vec1))-vec1.begin());
    for (int i = 0; i <= n; i++) {
        int j = lower_bound(all(vec2), a[i])-vec2.begin();
        if (j == vec2.size()) {
            vec2.pb(a[i]);
            dp[i] = vec2.size();
        }
        else {
            vec2[j] = a[i];
            dp[i] = j+1;
        }
        j = lower_bound(all(vec1), a[i])-vec1.begin();
        upd(j, dp[i], 1);
    }
    vec2.clear();
    int ans = 0;
    for (int i = n; i >= 0; i--) {
        int res;
        int j = lower_bound(all(vec2), -a[i])-vec2.begin();
        if (j == vec2.size()) {
            vec2.pb(-a[i]);
            res = vec2.size();
        }
        else {
            vec2[j] = -a[i];
            res = j+1;
        }
        j = lower_bound(all(vec1), a[i])-vec1.begin();
        upd(j, dp[i], -1);
        j = lower_bound(all(vec1), a[i]+x)-vec1.begin();
        smax(ans, get(j-1)+res);
        // cout << i << ' ' << res << ' ' << get(j-1) << '\n';
        // cout << get(j-1)+res << '\n';
    }
    cout << ans-1 << '\n';
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'void upd(long long int, long long int, long long int)':
glo.cpp:24:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (i++; i <= vec1.size(); i += i&(-i)) {
      |               ~~^~~~~~~~~~~~~~
glo.cpp: In function 'int32_t main()':
glo.cpp:49:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         if (j == vec2.size()) {
      |             ~~^~~~~~~~~~~~~~
glo.cpp:65:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         if (j == vec2.size()) {
      |             ~~^~~~~~~~~~~~~~

• 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