Haven't understand the code inside the main

[rsumitaj (Sumit Raj)]

please explain the code inside the main part

[asaurabh_26 (logical coder)]

in main first we make
dynamic 2D array
and then take input from user

if you want to understand how we to make 2D array dynamically
please go through this link
i have recently reply to this

Plz understand me dry run of this

to allocate 2D array of size MXN dynamically first we make array of size M this will store address of n sized m arrays int *arr=new int[M] now we make n sized m arrays for(int i=0;i<m;i++){ arr[i]=new int[n]; } i hope this picture will help you to understand well [Screenshot from 2020-05-03 11-25-10]

if find any doubt you can ask here as well

[rsumitaj (Sumit Raj)]

what is written in main(…)
please explain

[asaurabh_26 (logical coder)]

if you are asking about sum-of-all-submatrices-of a given matrix implementation approach 2
in the main the code is
int n,m;
cin>>n>>m;
int *arr=new int[n];
for(int i=0;i<n;i++){
arr[i]=new int[m];
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
cin>>arr[i][j];
}
}

so

@asaurabh_26

in main first we make
dynamic 2D array
and then take input from user

as i mention