Submission #739522

#	Time	Username	Problem	Language	Result	Execution time	Memory
739522		Dan4Life	Global Warming (CEOI18_glo)	C++17	100 / 100	56 ms	2400 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define all(a) a.begin(),a.end()
const int mxN = (int)2e5+10;
int n, x, a[mxN], l[mxN];
vector<int> v;

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> x; int ans = 0;
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0; i < n; i++) {
        auto itr = lower_bound(all(v),a[i]);
        l[i] = itr-begin(v)+1; ans = max(ans, l[i]);
        if (itr!=end(v)) *itr = a[i];
        else v.push_back(a[i]);
    }
    v.clear();
    for(int i = n-1; i >= 0; i--){ a[i]=-a[i]-x;
        auto itr = lower_bound(all(v),a[i]);
        int xd = lower_bound(all(v),a[i]+x)-begin(v);
        ans = max(ans, l[i]+xd);
        if (itr!=end(v)) *itr = a[i];
        else v.push_back(a[i]);
    }
    cout << ans;
}

• 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