/
Solution.java
82 lines (67 loc) · 3.13 KB
/
Solution.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;
class Result {
public static int hourglassSum(List<List<Integer>> arr) {
// System.out.println(arr);
int sumHigh = -63; /* Since the constraints specify that any value of the Hourglass pattern in the
2D Array would be within -9 <= value <= 9, we can assume that the least of the
sum can only go upto -63 (i.e., 7 values in an Hourglass pattern and 7 times (- or +) 9) */
for (int outer = 0; outer < arr.size() - 2; outer++) {
for (int inner = 0; inner < arr.get(outer).size() - 2; inner++) {
int sumNow = 0;
// First row in the Hourglass (3 elements)
for (int in_inner = inner; in_inner <= inner + 2; in_inner++) {
// System.out.println("First row: " + arr.get(outer).get(in_inner));
sumNow += arr.get(outer).get(in_inner);
}
// Second row in the Hourglass (1 element)
// System.out.println("Second row: " + arr.get(outer + 1).get(inner + 1));
sumNow += arr.get(outer + 1).get(inner + 1);
// Third row in the Hourglass (3 elements)
for (int in_innerNextNext = inner; in_innerNextNext <= inner + 2; in_innerNextNext++) {
// System.out.println("Third row: " + arr.get(outer + 2).get(in_innerNextNext));
sumNow += arr.get(outer + 2).get(in_innerNextNext);
}
// System.out.println("Sum, for now: " + sumNow);
if (sumNow > sumHigh) {
sumHigh = sumNow;
}
// System.out.println("Highest sum yet: " + sumHigh);
// System.out.println("///");
}
}
return sumHigh;
}
}
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
List<List<Integer>> arr = new ArrayList<>();
IntStream.range(0, 6).forEach(i -> {
try {
arr.add(
Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
.map(Integer::parseInt)
.collect(toList())
);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
});
int result = Result.hourglassSum(arr);
bufferedWriter.write(String.valueOf(result));
bufferedWriter.newLine();
bufferedReader.close();
bufferedWriter.close();
}
}