Chef and Strings Problem Code: CHEFSTR1 Solution Codechef

 #include <bits/stdc++.h>
using namespace std;
int main(){
  ios::sync_with_stdio(0);
  cin.tie(NULL);
  int t;
  cin>>t;
  while(t--){
    int n;
    cin>>n;
    int last,curr,tmp;
    long long sum=0;
    cin>>last;
    while(--n){
      cin>>tmp;
      curr=tmp;
      curr-=last;
      if(curr<0)curr=-curr;
      sum+=curr-1?curr-1:0;
      last=tmp;
    }
    cout<<sum<<endl;
  }
}