B. Also Try Minecraft.cpp

#include <bits/stdc++.h>
#define ll long long

using namespace std;


#define ll long long 
#define mod 1000000007
#define Time cerr << "time taken : " << (float)clock() / CLOCKS_PER_SEC << " secs" << endl;
#define pb push_back
#define mp make_pair
#define line cout << endl;
#define ff first
#define ss second
#define vi vector<int>
#define no cout << "NO" << endl;
#define yes cout << "YES" << endl;
#define printv(v)                      \
  for (int i = 0; i < (v.size()); i++) \
  {                                    \
    cout << v[i] << " ";               \
  }                                    \
  line;
#define onesbits(x) __builtin_popcountll(x)
#define zerobits(x) __builtin_ctzll(x)
#define sp(x, y) fixed << setprecision(y) << x
#define w(x) \
  int x;     \
  cin >> x;  \
  while (x--)
#define tk(x) \
  int x;      \
  cin >> x;
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
#define debug(x)     \
  cerr << #x << " "; \
  _print(x);         \
  cerr << endl;
#else
#define debug(x)
#endif
template <class T>
void _print(T t)
{
  cerr << t;
}

template <class T, class V>
void _print(pair<T, V> p)
{
  cerr << "{";
  _print(p.ff);
  cerr << ",";
  _print(p.ss);
  cerr << "}";
}

template <class T>
void _print(vector<T> v)
{
  cerr << "[ ";
  for (T i : v)
  {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}

template <class T>
void _print(vector<vector<T>> v)
{
  cerr << "[\n";
  for (int l = 0; l < v.size(); l++)
  {
    {
      for (int k = 0; k < v[l].size(); k++)
        cerr << v[l][k] << " ";
    }
    cerr << "\n";
  }
  cerr << "]";
}

template <class T, class V>
void _print(map<T, V> v)
{
  cerr << "[ ";
  for (auto i : v)
  {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}

template <class T>
void _print(set<T> v)
{
  cerr << "[ ";
  for (T i : v)
  {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}

const long long inf = 1e18;
const int MOD = 998244353;
const int MAX = 1e6;

bool isValid(string s)
{
  int len = s.size();
  for (int i = 0; i < len / 2; i++)
  {
    if (s[i] != s[len - 1 - i])
      return false;
  }
  return true;
}

void rotateMatrix(vector<vector<int>> &v, int n)
{
  for (int i = 0; i < n / 2; i++)
  {
    for (int j = i; j < n - i - 1; j++)
    {
      int ptr = v[i][j];
      v[i][j] = v[n - 1 - j][i];
      v[n - 1 - j][i] = v[n - 1 - i][n - 1 - j];
      v[n - 1 - i][n - 1 - j] = v[j][n - 1 - i];
      v[j][n - 1 - i] = ptr;
    }
  }
}

int binarySearch(vector<int> &arr,int target,int n) {
    int start=0,end=n-1;
    int mid=start+(end-start)/2;
    int ans=n;
   
    while(start<=end) {
        if(arr[mid]>=target) {
            ans=mid;
            end=mid-1;
        }
        else start=mid+1;
        mid=start+(end-start)/2;
    }
    return ans;
}



int n,m,a[201000];
ll s1[200010],s2[201000];
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++)cin>>a[i];
	for(int i=1;i<n;i++)s1[i]=s1[i-1]+max(a[i+1]-a[i],0),s2[i]=s2[i-1]+max(a[i]-a[i+1],0);
	for(int i=1,u,v;i<=m;i++){
		cin>>u>>v;
		if(u<v)cout<<s2[v-1]-s2[u-1]<<endl;
		else cout<<s1[u-1]-s1[v-1]<<endl;
	}
	return 0;
}