Submission #1130780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130780		mingga	Global Warming (CEOI18_glo)	C++17	100 / 100	48 ms	5824 KiB

glo

#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define int long long
const int MOD = 1e9 + 7;
const int inf = 2e18;
const int N = 2e5 + 7;
int n, x, a[N], f[N];

signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n >> x;
    for(int i = 1; i <= n; i++) cin >> a[i];
    vector<int> vec;
    int ans = 0;
    for(int i = 1; i <= n; i++) {
        int len = lower_bound(all(vec), a[i]) - vec.begin();
        f[i] = len + 1;
        if(len < sz(vec)) {
            vec[len] = a[i];
        } else vec.pb(a[i]);
        ans = max(ans, f[i]);
    }
    vector<int> vec2;
    for(int i = n; i > 0; i--) {
        int len = lower_bound(all(vec2), -a[i] + x) - vec2.begin();
        ans = max(ans, len + f[i]);
        int pos = lower_bound(all(vec2), -a[i]) - vec2.begin();
        if(pos < sz(vec2)) vec2[pos] = -a[i];
        else vec2.pb(-a[i]);
    }
    cout << ans << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

• 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