Submission #1265370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265370		son2008	Candies (JOI18_candies)	C++20	100 / 100	102 ms	11440 KiB

candies

#include <bits/stdc++.h>
using namespace std;
#define ii pair<int, int>
#define fi first
#define se second
#define int long long
#define ll long long
#define ld double
#define mp make_pair
#define lg2 30
#define iii pair<int, ii>
#define iiii pair<ii, ii>
#define base 29
#define eps 1e-8
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
int dx[] = {0LL, 0LL, 1, -1, 1, 1, -1, -1};
int dy[] = {1, -1, 0LL, 0LL, 1, -1, 1, -1};
const int maxn = 2e5 + 5;
const int mod = 1e9 + 7;
int n, a[maxn], l[maxn], r[maxn], choose[maxn];
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#define task "task"
    if (fopen(task ".inp", "r"))
    {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    cin >> n;
    priority_queue<ii> pq;
    a[0] = a[n + 1] = -1e18;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        pq.push({a[i], i});
        l[i] = i - 1;
        r[i] = i + 1;
    }
    int ans = 0;
    for (int j = 1; j <= (n + 1) / 2; j++)
    {
        while (choose[pq.top().se])
            pq.pop();
        int i = pq.top().se;
        pq.pop();
        ans += a[i];
        a[i] = a[l[i]] + a[r[i]] - a[i];
        choose[l[i]] = 1;
        choose[r[i]] = 1;
        pq.push({a[i], i});
        l[i] = l[l[i]];
        r[i] = r[r[i]];
        r[l[i]] = i;
        l[r[i]] = i;
        cout << ans << '\n';
    }
    cerr << endl
         << "TIME : " << clock() * 0.001 << "s" << endl;
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
candies.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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