Submission #367972

#	Time	Username	Problem	Language	Result	Execution time	Memory
367972		chctxdy68	Candies (JOI18_candies)	C++17	0 / 100	2 ms	620 KiB

candies

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#pragma GCC optimize ("Ofast")
#pragma GCC optimization ("unroll-loops, no-stack-protector")
#pragma GCC target ("avx")
#pragma GCC target ("avx2")
#pragma GCC target ("fma")
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define ll long long
#define ull unsigned long long
#define ld long double
#define pii pair <int, int>
#define pll pair <ll, ll>
#define pci pair <char, int>
#define pld pair <ld, ld>
#define ppld pair <pld, pld>
#define ppll pair <pll, pll>
#define pldl pair <ld, ll>
#define vll vector <ll>
#define vvll vector <vll>
#define vpll vector <pll>
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define mll map <ll, ll>
#define fastmap gp_hash_table
#define cd complex <double>
#define vcd vector <cd>
#define PI 3.14159265358979
#define ordered_set tree <ll, null_type, less <ll>, rb_tree_tag, tree_order_statistics_node_update>
#pragma 03
using namespace std;
using namespace __gnu_pbds;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll a[200005];
set <pll> choices; 
ll l[200005], r[200005];
int main(){
	fastio;
	ll n; cin >> n;
	for (ll i = 1; i <= n; i++){
		cin >> a[i]; l[i] = i - 1; r[i] = i + 1;
		choices.insert(mp(-a[i], i));
	}
	ll ans = 0;
	for (ll c = 0; c < (n + 1) / 2; c++){
		pll mx = *choices.begin();
		choices.erase(choices.begin());
		ans -= mx.fi;
		ll id = mx.se, lf = l[id], rg = r[id];
		if (lf) choices.erase(mp(-a[lf], lf));
		if (rg <= n) choices.erase(mp(-a[rg], rg));
		if (lf) l[id] = l[lf]; 
		else l[id] = 0;
		if (rg <= n) r[id] = r[rg];
		else r[id] = n + 1;
		if (l[id]) r[l[id]] = id; 
		if (r[id] <= n) l[r[id]] = id;
		a[id] = a[lf] + a[rg] - a[id];
		choices.insert(mp(-a[id], id));
		cout << ans << "\n"; 
	}
}

Compilation message (stderr)

candies.cpp:6: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    6 | #pragma GCC optimization ("unroll-loops, no-stack-protector")
      | 
candies.cpp:35: warning: ignoring #pragma 03  [-Wunknown-pragmas]
   35 | #pragma 03
      |

• Subtask 1: 0 / 8
• Subtask 2: 0 / 92