#include<bits/stdc++.h>
using namespace std;
int const maxn = 5e5+10;
#define int long long

int dp[maxn*2];
int a[maxn],b[maxn];

signed main(){
	int t;
	cin >> t ;
	while(t--){
		int n,m;
		cin >> n >> m ;
		for(int i = 1;i <= n;i ++){
			cin >>a[i] >> b[i];
		}
		memset(dp,0,sizeof dp);
		int j ,i;
		i = 1;
		for( j = 1;j <= m&&i <= n;j ++){
			dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
			i++;
		}
		cout <<max(dp[j-1] ,dp[max(j-2,0)] )<<'\n';
	}
	
	return 0;
}

answer.code: In function ‘int main()’:
answer.code:22:58: error: no matching function for call to ‘max(long long int, int)’
   22 |                         dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
      |                                                       ~~~^~~~~~~
In file included from /usr/include/c++/11/bits/specfun.h:45,
                 from /usr/include/c++/11/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:41,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:254:5: note: candidate: ‘template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)’
  254 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:254:5: note:   template argument deduction/substitution failed:
answer.code:22:58: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘int’)
   22 |                         dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
      |                                                       ~~~^~~~~~~
In file included from /usr/include/c++/11/bits/specfun.h:45,
                 from /usr/include/c++/11/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:41,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:300:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)’
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:300:5: note:   template argument deduction/substitution failed:
answer.code:22:58: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘int’)
   22 |                         dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
      |                                                       ~~~^~~~~~~
In file included from /usr/include/c++/11/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algo.h:3461:5: note: candidate: ‘template<class _Tp> constexpr _Tp std::max(std::initializer_list<_Tp>)’
 3461 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/11/bits/stl_algo.h:3461:5: note:   template argument deduction/substitution failed:
answer.code:22:58: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   22 |                         dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
      |                                                       ~~~^~~~~~~
In file included from /usr/include/c++/11/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algo.h:3467:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr _Tp std::max(std::initializer_list<_Tp>, _Compare)’
 3467 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/11/bits/stl_algo.h:3467:5: note:   template argument deduction/substitution failed:
answer.code:22:58: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   22 |                         dp[j] = max(dp[j-1] + a[i],dp[max(j-2,0)] + b[i]);
      |                                                       ~~~^~~~~~~
answer.code:25:43: error: no matching function for call to ‘max(long long int, int)’
   25 |                 cout <<max(dp[j-1] ,dp[max(j-2,0)] )<<'\n';
      |                                        ~~~^~~~~~~
In file included from /usr/include/c++/11/bits/specfun.h:45,
                 from /usr/include/c++/11/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:41,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:254:5: note: candidate: ‘template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)’
  254 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:254:5: note:   template argument deduction/substitution failed:
answer.code:25:43: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘int’)
   25 |                 cout <<max(dp[j-1] ,dp[max(j-2,0)] )<<'\n';
      |                                        ~~~^~~~~~~
In file included from /usr/include/c++/11/bits/specfun.h:45,
                 from /usr/include/c++/11/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:41,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:300:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)’
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:300:5: note:   template argument deduction/substitution failed:
answer.code:25:43: note:   deduced conflicting ...