#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
const long long MOD = 1000000007;
long long max_sum_after_operations(int n, int k, vector<int>& arr) {
vector<long long> prefix_sum(n + 1, 0);
for (int i = 0; i < n; ++i) {
prefix_sum[i + 1] = prefix_sum[i] + arr[i];
}
long long max_sum = numeric_limits<long long>::min();
for (int i = 0; i < n; ++i) {
for (int j = i + 1; j <= n; ++j) {
long long subarray_sum = prefix_sum[j] - prefix_sum[i];
max_sum = max(max_sum, subarray_sum);
}
}
max_sum += max_sum * (k - 1);
return max_sum % MOD;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t; // Number of test cases
while (t--) {
int n, k;
cin >> n >> k; // Length of the array and number of operations
vector<int> arr(n);
for (int i = 0; i < n; ++i) {
cin >> arr[i]; // Array elements
}
cout << max_sum_after_operations(n, k, arr) << endl; // Output result
}
return 0;
}
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
MTIKMiAyCi00IC03CjMgMwoyIDIgOAoxIDcKNwo1IDEKNCAtMiA4IC0xMiA5CjcgNAo4IDE0IC05IDYgMCAtMSAzCjcgMTAwCjUgMyAtOCAxMiAtNSAtOSAzCjYgMTAwMAotMTAwMDAwMDAwMCAtMTAwMDAwMDAwMCAtMTAwMDAwMDAwMCAtMTAwMDAwMDAwMCAtMTAwMDAwMDAwMCAtMTAwMDAwMDAwMAoyIDEKMTAwMDAwMDAwMCA4CjUgNAowIDAgMCAwIDAKNiAxMAo0ODk3MyA3NTcyOTIgNTgyNzcgLTM4NTc0IDI3NDc1IDk5OTk4NAo3IDEKLTEwMDAgMTAwMCAtMTAwMCAxMDAwIC0xMDAwIDEwMDAgLTEwMDAKMTAgMTAwNTAKNDA4MjkzODc0IC0zNDk4NTk3IDczNzQ3ODMgMjk1Nzc0OTMwIC00ODU3NDAzNCAyNjYyMzc4NCA0OTg3NTQ4MzMgLTI5NDg3NTgzMCAyODMwNDU4MDQgODU5MzgwNDUK
12
2 2
-4 -7
3 3
2 2 8
1 7
7
5 1
4 -2 8 -12 9
7 4
8 14 -9 6 0 -1 3
7 100
5 3 -8 12 -5 -9 3
6 1000
-1000000000 -1000000000 -1000000000 -1000000000 -1000000000 -1000000000
2 1
1000000000 8
5 4
0 0 0 0 0
6 10
48973 757292 58277 -38574 27475 999984
7 1
-1000 1000 -1000 1000 -1000 1000 -1000
10 10050
408293874 -3498597 7374783 295774930 -48574034 26623784 498754833 -294875830 283045804 85938045