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Copy pathDiagonalSum2dArray.java
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43 lines (37 loc) · 1.12 KB
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public class DiagonalSum2dArray {
public static void main(String[] args) {
System.out.println("Welcome to Diagonal Sum");
int[][] numArr = ArrayUtility.input2DArray();
long sum = sumOfDiagonals(numArr);
System.out.println("Sum of diagonals is: " + sum);
}
public static long sumOfDiagonals(int[][] numArr) {
long leftSum = sumOfLeftDiagonal(numArr);
long rightSum = sumOfRightDiagonal(numArr);
long sum = leftSum + rightSum;
if (numArr.length % 2 != 0) {
int ind = numArr.length / 2;
sum -= numArr[ind][ind];
}
return sum;
}
public static long sumOfLeftDiagonal(int[][] numArr) {
long sum = 0;
int i = 0;
while (i < numArr.length) {
sum += numArr[i][i];
i++;
}
return sum;
}
public static long sumOfRightDiagonal(int[][] numArr) {
long sum = 0;
int i = 0;
while (i < numArr.length) {
int col = numArr.length - 1 - i;
sum += numArr[i][col];
i++;
}
return sum;
}
}