Submission #1265086

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265086		Bui_Quoc_Cuong	Candies (JOI18_candies)	C++20	0 / 100	1 ms	320 KiB

candies

#include <bits/stdc++.h>
template <class A, class B>
    bool maximize (A &a, const B b){
        if (a < b) {
            a = b;
            return true;
        } return false;
    }
template <class A, class B>
    bool minimize (A &a, const B b) {
        if (a > b) {
            a = b;
            return true;
        } return false;
    }
#define FOR(i, a, b) for(int i = (a); i <= (int)(b); i++)
#define FORD(i, a, b) for(int i = (a); i >= (int)(b); i--)
#define fi first
#define se second
#define pb push_back
#define ALL(A) A.begin(), A.end()
#define BIT(mask,i) ((mask>>(i))&1)
#define ll long long
using namespace std;
const int maxN = 2e5 + 5;

int n;
int a[maxN], L[maxN], R[maxN];

void init(void) {
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
}

void process(void) {
    a[0] = a[n + 1] = - maxN;
    priority_queue <pair <int, int>, vector <pair <int, int>>> PQ;
    FOR(i, 1, n) {
        L[i] = i - 1;
        R[i] = i + 1;
        PQ.push({a[i], i});
    }
    vector <int> dd(n + 5, 0);
    long long ans = 0;
    FOR(id, 1, (n + 1) / 2) {
        while (!PQ.empty() && dd[PQ.top().second]) PQ.pop();
        auto [val, i] = PQ.top(); PQ.pop();
        dd[L[i]] = dd[R[i]] = 1;
        ans+= val;

        a[i] = a[L[i]] + a[R[i]] - a[i];
        PQ.push({a[i], i});

        L[i] = L[L[i]];
        R[L[i]] = i;

        R[i] = R[R[i]];
        L[R[i]] = i;

        cout << ans << "\n";
    }
}

int main(void) {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define koa "candies"
    if (fopen(koa".inp", "r")) {
        freopen(koa".inp", "r", stdin);
        freopen(koa".out", "w", stdout);
    }
    init();
    process();
    return 0;
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
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(koa".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(koa".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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