Submission #416211

#	Time	Username	Problem	Language	Result	Execution time	Memory
416211		duyanh1704	Global Warming (CEOI18_glo)	C++14	100 / 100	77 ms	10076 KiB

glo

#include <bits/stdc++.h>
#define int long long
using namespace std;

const int inf = 1e17 + 29;
int n, x, res;
vector<int> a;

vector<int> LIS(vector<int> a, int t, int d){
    vector<int> f(n + 5, inf); f[0] = -inf;
    vector<int> dp(n, 0);
    for (int i = 0; i < n; ++i){
        int k = lower_bound(f.begin(), f.end(), t * a[i] + d) - f.begin();
        dp[i] = k;
        k = lower_bound(f.begin(), f.end(), t * a[i]) - f.begin();
        f[k] = t * a[i];
    }
    return dp;
}

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);

    cin >> n >> x;
    for (int i = 1; i <= n; ++i){
        int t; cin >> t;
        a.push_back(t);
    }


    vector<int> f = LIS(a, 1, 0);
    reverse(a.begin(), a.end());
    vector<int> g = LIS(a, -1, x);
    reverse(g.begin(), g.end());


    for (int i = 0; i < n; ++i)
        res = max(res, f[i] + g[i] - 1);

    cout << res;
}

• 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