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IntervalAdd.java
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IntervalAdd.java
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package epi;
import epi.test_framework.EpiTest;
import epi.test_framework.EpiUserType;
import epi.test_framework.GenericTest;
import java.util.ArrayList;
import java.util.List;
public class IntervalAdd {
@EpiUserType(ctorParams = {int.class, int.class})
public static class Interval {
public int left, right;
public Interval(int l, int r) {
this.left = l;
this.right = r;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Interval interval = (Interval)o;
if (left != interval.left) {
return false;
}
return right == interval.right;
}
@Override
public String toString() {
return "[" + left + ", " + right + "]";
}
}
@EpiTest(testDataFile = "interval_add.tsv")
public static List<Interval> addInterval(List<Interval> disjointIntervals,
Interval newInterval) {
int i = 0;
List<Interval> result = new ArrayList<>();
// Processes intervals in disjointIntervals which come before newInterval.
while (i < disjointIntervals.size() &&
newInterval.left > disjointIntervals.get(i).right) {
result.add(disjointIntervals.get(i++));
}
// Processes intervals in disjointIntervals which overlap with newInterval.
while (i < disjointIntervals.size() &&
newInterval.right >= disjointIntervals.get(i).left) {
// If [a, b] and [c, d] overlap, their union is [min(a, c),max(b, d)].
newInterval = new Interval(
Math.min(newInterval.left, disjointIntervals.get(i).left),
Math.max(newInterval.right, disjointIntervals.get(i).right));
++i;
}
result.add(newInterval);
// Processes intervals in disjointIntervals which come after newInterval.
result.addAll(disjointIntervals.subList(i, disjointIntervals.size()));
return result;
}
public static void main(String[] args) {
System.exit(
GenericTest
.runFromAnnotations(args, "IntervalAdd.java",
new Object() {}.getClass().getEnclosingClass())
.ordinal());
}
}