Output of C++ code

Question

Hello,
Can someone explain the syntax of this code and what it does?

#include <iostream>
using namespace std;

int main() {
int mat[2][2] = {{1,2},{3,5}};
cout << 0[1[mat]];
return 0;
}

Answer 1

This is a two dimensional array and the code will print the first item from the second element.
cout<<mat[1[0]];

Answer 2

HBhZ_C
we could see that by running code...

but why 0[1[mat]] == mat[1[0]] ?

Answer 3

Not equal but the right side of assignments is the used syntax in other languages .print the first(index 0) item from the second element or row ==>3 visph

Answer 4

not equals?
but output same value ^^