Driver Code
int main ( ) { vector < vector < int > > grid = { { 7 , 1 , 4 , 5 , 6 } , { 2 , 5 , 1 , 6 , 4 } , { 1 , 5 , 4 , 3 , 2 } , { 1 , 2 , 7 , 3 , 4 } } ; cout << largestSquareValidMatrix ( grid ) ; return 0 ; }