How Transpose part of code in rotating image question works?

#1

I didn’t understand how transpose part of code works for each iteration, Can you please tell me with each diagram how this code:-
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
swap(a[i][j],[j][i]);}}

#2

The code swaps elements to transpose the matrix by flipping rows with columns symmetrically across the diagonal.

#3

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