/* This function should return a boolean (encoded as an int) indicating
* whether or not a path exists between the argument vertices.
* param: g Graph to perform the search in
* param: source Vertex to originate the search from
* param: destination Vertex to stop the search from (if it is found)
* ret: boolean indicating whether or not a path exists
*/
int BFS(Graph* g, Vertex* source, Vertex* destination)
{
/* FIXME you will write this */
//use queue
int contains = 0;
struct cirListDeque *queue = malloc(sizeof(struct cirListDeque));
initCirListDeque(queue);
clearVisited(g);
struct Vertex *current;
current = source;
while(current != destination)
{
if(current->isVisited == 0)
{
current->isVisited = 1;
for(int x = 0; x < current->numNeighbors; x++)
{
if(current->neighbors[x]->isVisited == 0)
{
addBackCirListDeque(queue, current->neighbors[x]);
}
}
if(!isEmptyCirListDeque(queue))
{
current = frontCirListDeque(queue);
removeFrontCirListDeque(queue);
}
else
return contains;
}
else
{
if(!isEmptyCirListDeque(queue))
{
current = frontCirListDeque(queue);
removeFrontCirListDeque(queue);
}
else
return contains;
}
}
if(current == destination)
{contains = 1;}
removeAllCirListDeque(queue);
return contains;
}
/* This function should return a boolean (encoded as an int) indicating
* whether or not a path exists between the argument vertices.
* param: g Graph to perform the search in
* param: source Vertex to originate the search from
* param: destination Vertex to stop the search from (if it is found)
* ret: boolean indicating whether or not a path exists
*/
int BFS(Graph* g, Vertex* source, Vertex* destination){
/* FIXME you will write this */
/* create and initialize circular list deque pointer */
struct cirListDeque *stack = malloc(sizeof(struct cirListDeque));
initCirListDeque(stack);
/*/ create vertex pointer and clear visited nodes */
struct Vertex *temp = source;
clearVisited(g);
/* add to front */
addFrontCirListDeque(stack, temp);
/* if not empty, use BFS */
while(!isEmptyCirListDeque(stack)){
/*remove back(top) value */
temp = backCirListDeque(stack);
removeBackCirListDeque(stack);
/* check if visited, mark, and return true */
if(!temp -> isVisited){
temp -> isVisited = 1;
}
if(temp == destination){
removeAllCirListDeque(stack);
return 1;
}
/* check is the neighboring nodes have been visited. add to stack if not */
for(int i = 0; i < temp->numNeighbors; i++){
if(!temp->neighbors[i]->isVisited){
addFrontCirListDeque(stack, temp->neighbors[i]);
}
}
}
return 0;
}
/* This function should return a boolean (encoded as an int) indicating
* whether or not a path exists between the argument vertices.
* param: g Graph to perform the search in
* param: source Vertex to originate the search from
* param: destination Vertex to stop the search from (if it is found)
* ret: boolean indicating whether or not a path exists
*/
int DFS(Graph* g, Vertex* source, Vertex* destination){
/* FIXME you will write this */
struct cirListDeque *stack = malloc(sizeof(struct cirListDeque));
initCirListDeque(stack);
struct Vertex *temp = source;
clearVisited(g);
/* add to the front of the circular list deque */
addFrontCirListDeque(stack, temp);
/*if it isn't empty, use DFS */
while(!isEmptyCirListDeque(stack)){
temp = backCirListDeque(stack);
removeBackCirListDeque(stack);
/* check if visited, mark if it hasn't been visited */
if(!temp -> isVisited){
temp ->isVisited = 1;
}
if(temp == destination){
/* if you reach the destination, remove from the list to free memory, return 1 */
removeAllCirListDeque(stack);
return 1;
}
/* check is the neighboring nodes have been visited. add to stack if not */
for(int i = 0; i < temp->numNeighbors; i++){
if(!temp->neighbors[i] -> isVisited){
addFrontCirListDeque(stack, temp->neighbors[i]);
}
}
}
return 0;
}
