At 7:30 what is bi=li+1 any why?

#1

what is bi=li+1 any why ???

#2

@premang
that is wrong it should be bi=li.

let me explain you approach
assuming we have N x M matrix

first we choose top left corner (i,j)
then we choose bottom right corner (bi,bj)
now we find sum of this considered submatrix.

for(int i = 0 ; i <= N-1 ; i++) {
for(int j = 0 ; j <= M-1 ; j++ ) {

  for(int  bi = i ; bi <= N-1 ; bi++) {
    for(int bj = j ; bj <= M-1; bj++) {
         // here (i,j) is coordinate of ur top left corner
        // (bi,bj) is coordinate of bottom right corner
       // compute sum of considered submatrix
 
  }
 }

}
}

#3

@premang …

#4

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