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#include <iostream>
#include <valarray>
using namespace std;
int maxDiagonal( const valarray<int> &M, int N )
{
return M[slice(0,N,N+1)].max();
}
int main()
{
valarray<int> A = { 1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
-1, -2, -3, -4 };
valarray<int> B = { 10, 25, 6, 2,
5, 13, 6, 1,
-1, 10, 7, 2,
0, 6, 24, 1 };
cout << maxDiagonal( A, 4 ) << " " << maxDiagonal( B, 4 ) << '\n';
}
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