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Resolves Java Stack task

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This commit is contained in:
Piotr Dec 2022-11-05 22:31:46 +01:00
parent 880f1b2d2c
commit 6e357de888
2 changed files with 108 additions and 0 deletions
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41
src/main/java/eu/ztsh/training/hackerrank/datastructures/stack/Solution.java Normal file
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package eu.ztsh.training.hackerrank.datastructures.stack;
import java.util.Map;
import java.util.Scanner;
import java.util.Stack;
/**
* Java Stack task.
* source: https://www.hackerrank.com/challenges/java-stack
*/
public class Solution {
public static void main(String[] args) {
var scanner = new Scanner(System.in);
while (scanner.hasNext()) {
var stack = new Stack<Character>();
var line = scanner.next();
for (char input : line.toCharArray()) {
if (stack.empty()) {
stack.push(input);
continue;
}
char head = stack.peek();
if (closingChars.getOrDefault(input, '0').equals(head)) {
stack.pop();
} else {
stack.push(input);
}
}
System.out.println(stack.empty());
}
}
private static final Map<Character, Character> closingChars = Map.of(
']', '[',
'}', '{',
')', '('
);
}

67
src/test/java/eu/ztsh/training/hackerrank/datastructures/stack/SolutionTest.java Normal file
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package eu.ztsh.training.hackerrank.datastructures.stack;
import java.util.List;
import eu.ztsh.training.hackerrank.HackerRankTest;
import eu.ztsh.training.hackerrank.SolutionClassDescription;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
@DisplayName("HackerRank challenges: Java Stack")
class SolutionTest extends HackerRankTest {
@Test
public void testCase0() {
simpleAssert(
List.of(
"{}()",
"({()})",
"{}(",
"[]"
),
List.of(
"true",
"true",
"false",
"true"
)
);
}
@Test
public void testCase1() {
simpleAssert(
List.of(
"({}[])",
"(({()})))",
"({(){}()})()({(){}()})(){()}",
"{}()))(()()({}}{}",
"}}}}",
"))))",
"{{{",
"(((",
"[]{}(){()}((())){{{}}}{()()}{{}{}}",
"[[]][][]",
"}{"
),
List.of(
"true",
"false",
"true",
"false",
"false",
"false",
"false",
"false",
"true",
"true",
"false"
)
);
}
@Override
protected SolutionClassDescription getSolutionClassDescription() {
return new SolutionClassDescription(Solution.class);
}
}