Question

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

Answer 1

int getBoundarySum(List<List<int>> matrix) {
    var rows = matrix.length;
    var cols = matrix[0].length;
    var sum = 0;
    
    for (var i = 0; i < rows; i++) {
        for (var j = 0; j < cols; j++) {
            if (i == 0 || j == 0 || i == rows - 1 || j == cols - 1) {
                sum += matrix[i][j];
            }
        }
    }
    
    return sum;
}

main() {
    List<List<int>> matrix = [ [1, 2, 3, 4], 
                               [5, 6, 7, 8], 
                               [9, 10, 11, 12] ];
    
    print(getBoundarySum(matrix));
}



   
/*
run:
   
65
   
*/

 
 

 

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