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DutchNationalFlag.java
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DutchNationalFlag.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.TimedExecutor;
import java.util.ArrayList;
import java.util.List;
public class DutchNationalFlag {
public enum Color { RED, WHITE, BLUE }
public static void dutchFlagPartition(int pivotIndex, List<Color> A) {
// TODO - you fill in here.
return;
}
@EpiTest(testDataFile = "dutch_national_flag.tsv")
public static void dutchFlagPartitionWrapper(TimedExecutor executor,
List<Integer> A, int pivotIdx)
throws Exception {
List<Color> colors = new ArrayList<>();
int[] count = new int[3];
Color[] C = Color.values();
for (int i = 0; i < A.size(); i++) {
count[A.get(i)]++;
colors.add(C[A.get(i)]);
}
Color pivot = colors.get(pivotIdx);
executor.run(() -> dutchFlagPartition(pivotIdx, colors));
int i = 0;
while (i < colors.size() && colors.get(i).ordinal() < pivot.ordinal()) {
count[colors.get(i).ordinal()]--;
++i;
}
while (i < colors.size() && colors.get(i).ordinal() == pivot.ordinal()) {
count[colors.get(i).ordinal()]--;
++i;
}
while (i < colors.size() && colors.get(i).ordinal() > pivot.ordinal()) {
count[colors.get(i).ordinal()]--;
++i;
}
if (i != colors.size()) {
throw new TestFailure("Not partitioned after " + Integer.toString(i) +
"th element");
} else if (count[0] != 0 || count[1] != 0 || count[2] != 0) {
throw new TestFailure("Some elements are missing from original array");
}
}
public static void main(String[] args) {
System.exit(
GenericTest
.runFromAnnotations(args, "DutchNationalFlag.java",
new Object() {}.getClass().getEnclosingClass())
.ordinal());
}
}