Submission #172466

#	Time	Username	Problem	Language	Result	Execution time	Memory
172466		mhy908	Candies (JOI18_candies)	C++14	100 / 100	163 ms	11972 KiB

candies

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
const LL llinf=9000000000000000000;
const int inf=2000000000;
int n;
LL arr[200010], pr[200010], ne[200010];
priority_queue<pair<LL, int> > pq;
int main()
{
    scanf("%d", &n);
    for(int i=1; i<=n; i++){
        scanf("%lld", &arr[i]);
        pq.push(mp(arr[i], i));
        if(i>1)pr[i]=i-1;
        if(i<n)ne[i]=i+1;
    }
    LL ans=0;
    for(int i=1; i<=(n+1)/2; i++){
        while(pq.top().F!=arr[pq.top().S])pq.pop();
        int t=pq.top().S;
        ans+=arr[t];
        printf("%lld\n", ans);
        int l=pr[t];
        int r=ne[t];
        ne[t]=ne[r];
        pr[t]=pr[l];
        pr[ne[r]]=t;
        ne[pr[l]]=t;
        if(l&&r)arr[t]=max(arr[l]+arr[r]-arr[t], -llinf);
        else arr[t]=-llinf;
        arr[l]=arr[r]=-llinf;
        pq.push(mp(arr[t], t));
    }
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
candies.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
candies.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &arr[i]);
         ~~~~~^~~~~~~~~~~~~~~~~

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