Submission #580561

#	Time	Username	Problem	Language	Result	Execution time	Memory
580561		talant117408	Global Warming (CEOI18_glo)	C++17	100 / 100	58 ms	2768 KiB

glo

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define long                unsigned long 
#define pb                  push_back
#define mp                  make_pair
#define all(v)              (v).begin(),(v).end()
#define rall(v)             (v).rbegin(),(v).rend()
#define lb                  lower_bound
#define ub                  upper_bound
#define sz(v)               int((v).size())
#define do_not_disturb      ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl                '\n'

void solve() {
    int n, x;
    const int INF = 2e9+2e6;
    cin >> n >> x;
    vector <int> v(n);
    for (auto &to : v) cin >> to;
    vector <int> dp(n, INF);
    vector <int> pref(n);
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int it = lb(all(dp), v[i])-dp.begin();
        ans = max(ans, it+1);
        dp[it] = v[i];
        pref[i] = it+1;
    }
    fill(all(dp), INF);
    for (int i = n-1; i >= 0; i--) {
        int it = lb(all(dp), -v[i]+x)-dp.begin();
        ans = max(ans, pref[i]+it);
        it = lb(all(dp), -v[i])-dp.begin();
        dp[it] = -v[i];
    }
    cout << ans;
}

int main() {
    do_not_disturb
    
    int t = 1;
    //~ cin >> t;
    while (t--) {
        solve();
    }
    
    return 0;
}

• 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