Submission #789184

#	Time	Username	Problem	Language	Result	Execution time	Memory
789184		boyliguanhan	Global Warming (CEOI18_glo)	C++17	100 / 100	88 ms	5080 KiB

glo

#include<bits/stdc++.h>
using namespace std;
int pre[200100], suf[200100], arr[200100], ans;
vector<int> v;
int main() {
    int n, x;
    cin >> n >> x;
    for(int i = 0; i < n; i++) {
        cin >> arr[i];
        auto it = lower_bound(v.begin(), v.end(), arr[i]);
        pre[i] = it-v.begin()+1;
        if(it==v.end())
            v.push_back(arr[i]);
        else *it = arr[i];
    }
    v.clear();
    for(int i = n; i--;) {
        auto it = lower_bound(v.begin(), v.end(), arr[i], [](int a, int b){return a>b;});
        auto i2 = lower_bound(v.begin(), v.end(), arr[i] - x, [](int a, int b){return a>b;});
        suf[i] = i2-v.begin()+1;
        if(it==v.end())
            v.push_back(arr[i]);
        else *it = arr[i];
    }
    for(int i = 0; i < n; i++){
        ans = max(ans, pre[i]+suf[i]-1);
    }
    cout << ans << '\n';
}

• 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