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- #include <iostream>
- #include<bits/stdc++.h>
- #include<utility>
- #define ll long long
- #define ull unsigned long long
- #define pi 3.14159
- #define OO 2000000000
- //#define ceil(w, m) (((w) / (m)) + ((w) % (m) ? 1 : 0))
- using namespace std;
- void yasmeen_fakhri(){
- ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
- #ifndef ONLINE_JUDGE
- freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
- #endif
- }
- void solve(){
- ll ch=INT_MIN;
- ll n; cin>>n;
- ll arr[n];
- for(int i=0;i<n;i++){
- cin>>arr[i];
- }
- for(int i=0;i<(n-1);i++){
- if((arr[i]*arr[i+1])+(arr[i]-arr[i+1])>ch) {
- ch=(arr[i]*arr[i+1])+abs((arr[i]-arr[i+1]));
- }
- }
- cout<<ch<<"\n";
- }
- int main() {
- yasmeen_fakhri();
- int test =1;
- cin>>test;
- while(test--){
- solve();
- }
- return 0;
- }
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