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B.cpp
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B.cpp
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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define vi vector<int>
#define pii pair<int, int>
#define all v.begin(),v.end()
#define mod 1000000007
#define ps(x,y) fixed << setprecision(y) << x
#define fastio ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
int main()
{
fastio
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int T;
cin >> T;
while (T-- > 0)
{
int n;
cin >> n;
vector<ll> v;
for (int i = 0; i < n; i++) {
ll num; cin >> num;
v.pb(num);
}
ll operations = 0;
for (int i = 1; i < n; i++) {
operations += abs(v[i] - v[i - 1]);
}
ll opt1 = 0, opt2 = 0, opt3 = -1;
opt1 = abs(v[1] - v[0]);
opt2 = abs(v[n - 1] - v[n - 2]);
for (int i = 1; i < n - 1; i++) {
opt3 = max(opt3, abs(abs(v[i + 1] - v[i]) + abs(v[i] - v[i - 1]) - abs(v[i + 1] - v[i - 1])));
}
ll opt_chc = max({opt1, opt2, opt3});
cout << operations - opt_chc << '\n';
}
return 0;
}