Submission #585338

#	Time	Username	Problem	Language	Result	Execution time	Memory
585338		BhavayGoyal	Global Warming (CEOI18_glo)	C++14	100 / 100	50 ms	4420 KiB

glo

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

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class T> using oset = 
            tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second

const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;

const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};


// -------------------------------------------------- Main Code --------------------------------------------------

void sol() {
    int n, k; cin >> n >> k;
    int arr[n], longestPref[n] = {0};
    for (int i = 0; i < n; i++) cin >> arr[i];
    int ans = 1; vi dp;
    for (int i = 0; i < n; i++) {
        int x = lower_bound(all(dp), arr[i]) - dp.begin();
        longestPref[i] = x+1;
        ans = max(ans, longestPref[i]);
        if (x == dp.size()) dp.pb(arr[i]);
        else dp[x] = arr[i];
    }
    dp.clear();
    for (int i = n-1; i >= 0; i--) {
        int x = lower_bound(all(dp), -arr[i]+k) - dp.begin();
        ans = max(ans, longestPref[i] + x);
        x = lower_bound(all(dp), -arr[i]) - dp.begin();
        if (x == dp.size()) dp.pb(-arr[i]);
        else dp[x] = -arr[i];
    }
    cout << ans << endl;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    // cin >> t; 
    while (t--) {
        sol();
    }
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'void sol()':
glo.cpp:41:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         if (x == dp.size()) dp.pb(arr[i]);
      |             ~~^~~~~~~~~~~~
glo.cpp:49:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         if (x == dp.size()) dp.pb(-arr[i]);
      |             ~~^~~~~~~~~~~~

• 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