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AlternatingArray.java
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AlternatingArray.java
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package epi;
import epi.test_framework.EpiTest;
import epi.test_framework.GenericTest;
import epi.test_framework.TestFailure;
import epi.test_framework.TestUtils;
import epi.test_framework.TimedExecutor;
import java.text.Format;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class AlternatingArray {
public static void rearrange(List<Integer> A) {
for (int i = 1; i < A.size(); ++i) {
if (((i % 2) == 0 && A.get(i - 1) < A.get(i)) ||
((i % 2) != 0 && A.get(i - 1) > A.get(i))) {
Collections.swap(A, i - 1, i);
}
}
}
private static void checkOrder(List<Integer> A) throws TestFailure {
for (int i = 0; i < A.size(); ++i) {
if ((i % 2) != 0) {
if (A.get(i) < A.get(i - 1)) {
throw new TestFailure()
.withProperty(TestFailure.PropertyName.RESULT, A)
.withMismatchInfo(
i, String.format("A[%d] <= A[%d]", i - 1, i),
String.format("%d > %d", A.get(i - 1), A.get(i)));
}
if (i < A.size() - 1) {
if (A.get(i) < A.get(i + 1)) {
throw new TestFailure()
.withProperty(TestFailure.PropertyName.RESULT, A)
.withMismatchInfo(
i, String.format("A[%d] >= A[%d]", i, i + 1),
String.format("%d < %d", A.get(i), A.get(i + 1)));
}
}
} else {
if (i > 0) {
if (A.get(i - 1) < A.get(i)) {
throw new TestFailure()
.withProperty(TestFailure.PropertyName.RESULT, A)
.withMismatchInfo(
i, String.format("A[%d] >= A[%d]", i - 1, i),
String.format("%d < %d", A.get(i - 1), A.get(i)));
}
}
if (i < A.size() - 1) {
if (A.get(i + 1) < A.get(i)) {
throw new TestFailure()
.withProperty(TestFailure.PropertyName.RESULT, A)
.withMismatchInfo(
i, String.format("A[%d] <= A[%d]", i, i + 1),
String.format("%d > %d", A.get(i), A.get(i + 1)));
}
}
}
}
}
@EpiTest(testDataFile = "alternating_array.tsv")
public static void rearrangeWrapper(TimedExecutor executor, List<Integer> A)
throws Exception {
List<Integer> result = new ArrayList<>(A);
executor.run(() -> rearrange(result));
TestUtils.assertAllValuesPresent(A, result);
checkOrder(result);
}
public static void main(String[] args) {
System.exit(
GenericTest
.runFromAnnotations(args, "AlternatingArray.java",
new Object() {}.getClass().getEnclosingClass())
.ordinal());
}
}