30. In the implementation for a breadth-first search we studied, a queue was used. The code below replacesthe queue with a stack. List the pre-order enumeration that the vertices in the graph below are visitedusing this modified method, starting from vertex 0.}3/** stack-based search */static void modSearch (Graph G, int start) {Stack S new AStack (G.n());S.push(start);}6G.setMark (start, VISITED);while (S.length) > 0) {}modSearch:intv S.pop();PreVisit (G, v);for (int w = G.first (v); w < G.n(); w = G.next(v, w))if (G.getMark (w) == UNVISITED) {G.setMark (w, VISITED);S.push(w);

When traversing a graph, the usual approach for breadth-first search (BFS) involves utilizing a…

0. In the implementation for a breadth-first search we studied, a queue was used. The code below replaces the queue with a stack. List the pre-order enumeration that the vertices in the graph below are visited using this modified method, starting from vertex 0. 0 } 1 } 2 3 } 4 5 6 /** stack-based search */ static void modSearch (Graph G, int start) { Stack S = new AStack(G.n()); S.push(start); G.setMark (start, VISITED); while (S.length() > 0) { int v S.pop(); = PreVisit (G, v); 7 modSearch: for (int w = G.first (v); w < G.n(); w= G.next(v, w)) if (G.getMark (w) == UNVISITED) { G.setMark (w, VISITED); S.push(w);

0. In the implementation for a breadth-first search we studied, a queue was used. The code below replaces the queue with a stack. List the pre-order enumeration that the vertices in the graph below are visited using this modified method, starting from vertex 0. 0 } 1 } 2 3 } 4 5 6 /** stack-based search */ static void modSearch (Graph G, int start) { Stack S = new AStack(G.n()); S.push(start); G.setMark (start, VISITED); while (S.length() > 0) { int v S.pop(); = PreVisit (G, v); 7 modSearch: for (int w = G.first (v); w < G.n(); w= G.next(v, w)) if (G.getMark (w) == UNVISITED) { G.setMark (w, VISITED); S.push(w);