Submission #1124245

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124245		kh0i	Candies (JOI18_candies)	C++20	100 / 100	91 ms	9180 KiB

candies

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

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

using ll = long long;
using pii = pair<int, int>;

#define F first
#define S second
#define sz(x) (int)((x).size())
#define all(x) (x).begin(), (x).end()

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll get_rand(ll l, ll r) {
    assert(l <= r);
    return uniform_int_distribution<ll> (l, r)(rng);
}

const int N = 2e5 + 3;

int n, nxt[N], pre[N];
ll a[N], res[N];
bool del[N];

void solve(){
    cin >> n;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
        nxt[i] = i + 1;
        pre[i] = i - 1;
    }
    nxt[0] = 1, pre[n + 1] = n;
    a[0] = a[n + 1] = -1e18;
    priority_queue<pair<ll, int>> pq;
    for(int i = 1; i <= n; ++i)
        pq.push(make_pair(a[i], i));

    int cnt = 0;
    ll cur = 0;
    while(!pq.empty() and cnt < (n + 1) / 2){
        pair<ll, int> x = pq.top();
        pq.pop();
        int id = x.S;
        if(del[id])
            continue;
        cur += x.F;
        ++cnt;
        res[cnt] = cur;

        del[pre[id]] = del[nxt[id]] = 1;
        a[id] = a[pre[id]] + a[nxt[id]] - x.F;

        nxt[id] = nxt[nxt[id]];
        pre[id] = pre[pre[id]];
        nxt[pre[id]] = pre[nxt[id]] = id;

        pq.push({a[id], id});
    }

    for(int i = 1; i <= cnt; ++i)
        cout << res[i] << "\n";
}

int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    #define task "troll"
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int test = 1;
//    cin >> test;
    for(int i = 1; i <= test; ++i){
//        cout << "Case #" << i << ": ";
        solve();
    }
    #ifdef LOCAL
        cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    #endif
    return 0;
}

Compilation message (stderr)

candies.cpp: In function 'int32_t main()':
candies.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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