Question

How to find the sum of boundary elements of a matrix in Rust

Answer 1

#![allow(non_snake_case)]
use std::vec;

fn getBoundarySum(matrix : &mut Vec<Vec<i32>>) -> i32 {        
    let rows = matrix.len();
    let cols = matrix[0].len();
    let mut sum = 0;
    
    {
        let mut i = 0;
        while i < rows {
            {
                let mut j = 0;
                while j < cols {
                    if i == 0 || j == 0 || i == rows - 1 || j == cols - 1 {
                        sum += matrix[i][j];
                    }
                    j += 1;
                }
            }
            i += 1;
        }
    }
    
    return sum;
}
    
fn main() {        
    let mut matrix : Vec<Vec<i32>> = vec![ vec![1, 2, 3, 4], 
                                           vec![5, 6, 7, 8], 
                                           vec![9, 10, 11, 12]];
    
    println!("{}", getBoundarySum(&mut matrix));
}




/*
run:
   
65
   
*/

 

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