Submission #834468

#	Time	Username	Problem	Language	Result	Execution time	Memory
834468		urieg	Safety (NOI18_safety)	C++17	100 / 100	45 ms	5404 KiB

safety

#include<bits/stdc++.h>
#define rall(x) x.rbegin(), x.rend()
#define fi first
#define se second
#define ve vector
typedef long long ll;
using namespace std;



int main(){
//    ios_base::sync_with_stdio(0);cin.tie(0);
    ll n, a, h;
    priority_queue<ll>ql;
    priority_queue<ll, vector<ll>, greater<ll>>qr;
    long long ans = 0, h1=0,h2=0;
    scanf("%lld%lld%lld", &n, &h, &a);
    ql.push(a);
    qr.push(a);

    for(int i = 1; i<n; i++){
        h1 -= h;
        h2 += h;
        scanf("%lld", &a);
        if(ql.top()+h1<a && a<qr.top()+h2){
            ql.push(a-h1);
            qr.push(a-h2);
        }
        else if(a <= ql.top()+h1){
            ans += ql.top()+h1 - a;
            ql.push(a-h1);
            ql.push(a-h1);
            qr.push(ql.top()+h1-h2);
            ql.pop();
        }
        else if(qr.top()+h2 <= a){
            ans += a - qr.top()-h2;
            qr.push(a-h2);
            qr.push(a-h2);
            ql.push(qr.top()+h2-h1);
            qr.pop();
        }
    }
    cout<<ans;
    return 0;
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf("%lld%lld%lld", &n, &h, &a);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
safety.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         scanf("%lld", &a);
      |         ~~~~~^~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29