OBI 2014 fase 1 Fechadura

a.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {

    int n,m;cin>>n>>m;
    int arr[n];

    for(int i=0;i<n;i++) cin>>arr[i];

    int acc=0;

    for(int i=0;i<n-1;i++) {
        int mn = arr[i];

        if(arr[i]==m) continue;

        if(mn < m) {
            arr[i] += m-mn;
            arr[i+1] += m-mn;
            acc += m-mn;
        } else if( mn > m) {
            arr[i] -= mn-m;
            arr[i+1] -= mn-m;
            acc += mn-m;
        }
    }

    cout<<acc<<'\n';

    return 0;
}