Submission #849837

#	Time	Username	Problem	Language	Result	Execution time	Memory
849837		overwatch9	Global Warming (CEOI18_glo)	C++17	17 / 100	82 ms	4348 KiB

glo

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
    int n, x;
    cin >> n >> x;
    vector <int> nums(n);
    for (int i = 0; i < n; i++)
        cin >> nums[i];
    vector <int> lis(n), dp;
    for (int i = 0; i < n; i++) {
        auto x = lower_bound(dp.begin(), dp.end(), nums[i]);
        if (x == dp.end())
            dp.push_back(nums[i]);
        else
            *x = nums[i];
        lis[i] = dp.size();
    }
    dp.clear();
    for (int i = 0; i < n; i++)
        nums[i] = -(nums[i] + x);
    int ans = 0;
    for (int i = n-1; i >= 0; i--) {
        auto z = lower_bound(dp.begin(), dp.end(), nums[i]);
        if (z == dp.end())
            dp.push_back(nums[i]);
        else
            *z = nums[i];
        if (i-1 >= 0) {
            auto y = lower_bound(dp.begin(), dp.end(), nums[i-1] + x);
            ans = max(ans, (int)(y - dp.begin()) + lis[i-1]);
        }
    }
    cout << ans << '\n';
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25