bool test_random(int numItems) {
MinBinaryHeap h;
Container ** nodePointers = new Container * [numItems];
IntegerData ** values = new IntegerData * [numItems];
bool failed = false;
int i;
for (i = 0; i < numItems; i++) {
// need to be careful not to work with data that is near integer max or min value
values[i] = new IntegerData(rand() % numItems);
nodePointers[i] = h.insert(values[i]);
}
failed = false;
for (i = 0; i < numItems; i++) {
// need to be careful not to work with data that is near integer max or min value
// because if we subtract from min or add to max we get overflow (undefined behavior)
if (i % 2 == 0) {
values[i]->value -= rand() % numItems;
h.decreaseKey(nodePointers[i]);
}
else {
values[i]->value += rand() % numItems;
h.increaseKey(nodePointers[i]);
}
}
IntegerData * x = (IntegerData*)h.deleteMin();
int lastValue = x->value;
delete x;
for(i = 1; i < numItems; i++ ) {
x = (IntegerData*)h.deleteMin();
if( x->value < lastValue ) {
cout << "Oops! " << x->value << " is not >= " << lastValue << endl;
failed = true;
}
lastValue = x->value;
delete x;
}
if (failed) {
cout << "random test failed" << endl;
}
else {
cout << "random test successful" << endl;
}
delete [] nodePointers;
delete [] values;
return failed;
}
bool test_increase_decreaseKey(int numItems) {
MinBinaryHeap h;
Container ** nodePointers = new Container * [numItems];
IntegerData ** values = new IntegerData * [numItems];
bool failed = false;
int i;
for (i = 0; i < numItems; i++) {
values[i] = new IntegerData(i);
nodePointers[i] = h.insert(values[i]);
}
failed = false;
for (i = 0; i < numItems; i++) {
// decrease all the even ones by 1, increase all the odd ones by 9998
// should result in the sequence -1, 1, 3, ..., 9995, 9997, (odds + 9998)=9999, 10001...
if (i % 2 == 0) {
values[i]->value--;
h.decreaseKey(nodePointers[i]);
}
else {
values[i]->value+=9998;
h.increaseKey(nodePointers[i]);
}
}
for(i = 0; i < numItems; i++ ) {
IntegerData * x = (IntegerData*)h.deleteMin();
if( x->value != (i*2-1) ) {
cout << "Oops! " << (i*2-1) << " != " << x->value << endl;
failed = true;
}
delete x;
}
if (failed) {
cout << "decreaseKey evens/increaseKey odds 0:9999 failed" << endl;
}
else {
cout << "decreaseKey evens/increaseKey odds 0:9999 successful" << endl;
}
delete [] nodePointers;
delete [] values;
return failed;
}