1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#include <iostream>
using namespace std;

int tab [1002];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n, k;
    cin>>n>>k;
    
    for (int i=1; i<=n; i++)
    {
        cin>>tab [i];
    }
    long long wynik = 0;
    for (int i=1; i<n; i++)
    {
        if (tab [i] - k > tab [i+1])
        {
            wynik += (tab [i] - k - tab [i+1]);
            tab [i+1] = tab [i] - k;
        }
    }
    for (int i=n; i>=2; i--)
    {
        if (tab [i] - k > tab [i-1])
        {
            wynik += (tab [i] - k - tab [i-1]);
            tab [i-1] = tab [i] - k;
        }
    }
    cout<<wynik;
     
    return 0;
}