Submission #1093141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093141		anhthi	Candies (JOI18_candies)	C++14	100 / 100	69 ms	11196 KiB

candies

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long
#define mp(x, y) make_pair(x, y)
#define sz(v) ((int) (v).size())
#define all(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define BIT(x, y) (((x) >> (y)) & 1)
#define pb push_back
#define max_rng *max_element
#define min_rng *min_element
#define rep(i, n) for(int i = 1, _n = (n); i <= _n; ++i)
#define forn(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
#define ford(i, a, b) for(int i = (a), _b = (b); i >= _b; --i)

template <class X, class Y>
    inline bool maximize(X &x, Y y) {
        return (x < y ? x = y, true : false);
    }

template <class X, class Y>
    inline bool minimize(X &x, Y y) {
        return (x > y ? x = y, true : false);
    }

template <class X>
    inline void compress(vector<X> &a) {
        sort(all(a));
        a.resize(unique(all(a)) - a.begin());
    }

int ctz(ll x) { return __builtin_ctzll(x); }
int lg(ll x) { return 63 - __builtin_clzll(x); }
int popcount(ll x) { return __builtin_popcount(x); }

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) {
    return l + abs((ll) rng()) % (r - l + 1);
}

const ll oo = (ll) 1e17;
const int inf = (ll) 2e9 + 7, mod = (ll) 1e9 + 7;

const int mxn = 2e5 + 5, mxm = 3e2 + 5;
const int LG = 18, BASE = 311, BLOCK = 350;

void add(int &x, int y) { x += y; if (x >= mod) x -= mod; }
void sub(int &x, int y) { x -= y; if (x < 0) x += mod; }

int n;
ll a[mxn];

int pre[mxn], nxt[mxn], del[mxn];
priority_queue<pair<ll, int>> pq;

int main(void) {

    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define TASK "cquery"
    if (fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }

    cin >> n;
    rep(i, n) {
        cin >> a[i];
        pq.push({a[i], i});
        nxt[i] = i + 1;
        pre[i] = i - 1;
    }

    ll cur = 0;
    a[0] = a[n + 1] = -oo;

    for (int i = 1; i <= (n + 1) / 2; ++i) {

        while (del[ pq.top().se ]) pq.pop();

        int x = pq.top().se; pq.pop();
        cur += a[x];
        a[x] = a[pre[x]] + a[nxt[x]] - a[x];

        pq.push({a[x], x});
        del[pre[x]] = del[nxt[x]] = true;
        nxt[x] = nxt[nxt[x]];
        pre[x] = pre[pre[x]];
        nxt[pre[x]] = x;
        pre[nxt[x]] = x;

        cout << cur << '\n';
    }

    return 0;
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
candies.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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