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my solution
int sum[] = new int[16]; int h = 0; for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { sum[h] = arr[i][j] + arr[i][j+1] + arr[i][j+2] + arr[i+1][j+1] + arr[i+2][j] + arr[i+2][j+1] + arr[i+2][j+2]; h++; } } Arrays.sort(sum); System.out.println(sum[15]);
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Day 11: 2D Arrays
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my solution