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Breadth First Search : 

Breadth First Search A B F I E H D C G FIFO Queue - front

Breadth First Search : 

Breadth First Search A B F I E H D C G A FIFO Queue - front enqueue source node

Breadth First Search : 

Breadth First Search A B F I E H D C G A FIFO Queue - front dequeue next vertex

Breadth First Search : 

Breadth First Search front visit neighbors of A A B F I E H D C G - FIFO Queue

Breadth First Search : 

Breadth First Search front visit neighbors of A A B F I E H D C G - FIFO Queue

Breadth First Search : 

Breadth First Search B front B discovered A B F I E H D C G - A FIFO Queue

Breadth First Search : 

Breadth First Search B front visit neighbors of A A F I E H D C G - B A FIFO Queue

Breadth First Search : 

Breadth First Search B I front I discovered A F I E H D C G - B A A FIFO Queue

Breadth First Search : 

Breadth First Search B I front finished with A A F I E H D C G - B A A FIFO Queue

Breadth First Search : 

Breadth First Search B I front F I E H D C G - B A A dequeue next vertex FIFO Queue A

Breadth First Search : 

Breadth First Search I front F I E H D C G - B A A visit neighbors of B FIFO Queue A

Breadth First Search : 

Breadth First Search I front F I E H D C G - B A A visit neighbors of B FIFO Queue A

Breadth First Search : 

Breadth First Search I F front F I E H D C G - B A A F discovered B FIFO Queue A

Breadth First Search : 

Breadth First Search I F front F I E H D C G - B A A visit neighbors of B B FIFO Queue A

Breadth First Search : 

Breadth First Search I F front F I E H D C G - B A A A already discovered B FIFO Queue A

Breadth First Search : 

Breadth First Search I F front F I E H D C G - B A A finished with B B FIFO Queue A

Breadth First Search : 

Breadth First Search I F front F I E H D C G - A A dequeue next vertex B FIFO Queue B A

Breadth First Search : 

Breadth First Search F front F I E H D C G - A A visit neighbors of I B FIFO Queue B A

Breadth First Search : 

Breadth First Search F front F I E H D C G - A A visit neighbors of I B FIFO Queue B A

Breadth First Search : 

Breadth First Search F front F I E H D C G - A A A already discovered B FIFO Queue B A

Breadth First Search : 

Breadth First Search F front F I E H D C G - A A visit neighbors of I B FIFO Queue B A

Breadth First Search : 

Breadth First Search F E front F I E H D C G - A A E discovered B I FIFO Queue B A

Breadth First Search : 

Breadth First Search F E front F I E H D C G - A A visit neighbors of I B I FIFO Queue B A

Breadth First Search : 

Breadth First Search F E front F I E H D C G - A A F already discovered B I FIFO Queue B A

Breadth First Search : 

Breadth First Search F E front F I E H D C G - A A I finished B I FIFO Queue B A

Breadth First Search : 

Breadth First Search F E front F E H D C G - A A dequeue next vertex B I FIFO Queue B A I

Breadth First Search : 

Breadth First Search E front F E H D C G - A A visit neighbors of F B I FIFO Queue B A I

Breadth First Search : 

Breadth First Search E G front F E H D C G - A A G discovered B I F FIFO Queue B A I

Breadth First Search : 

Breadth First Search E G front F E H D C G - A A F finished B I F FIFO Queue B A I

Breadth First Search : 

Breadth First Search E G front E H D C G - A A dequeue next vertex B I F FIFO Queue I F B A

Breadth First Search : 

Breadth First Search G front E H D C G - A A visit neighbors of E B I F FIFO Queue I F B A

Breadth First Search : 

Breadth First Search G front H D C G - A A E finished B I F FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search G front H D C G - A A dequeue next vertex B I F FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search front H D C G - A A visit neighbors of G B I F FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search C front H D C G - A A C discovered B I F G FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search C front H D C G - A A visit neighbors of G B I F G FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search C H front H D C G - A A H discovered B I F G G FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search C H front H D C G - A A G finished B I F G G FIFO Queue I F B A E

Breadth First Search : 

Breadth First Search C H front H D C - A A dequeue next vertex B I F G G FIFO Queue I F B A E G

Breadth First Search : 

Breadth First Search H front H D C - A A visit neighbors of C B I F G G FIFO Queue I F B A E G

Breadth First Search : 

Breadth First Search H D front H D C - A A D discovered B I F G G C FIFO Queue I F B A E G

Breadth First Search : 

Breadth First Search H D front H D C - A A C finished B I F G G C FIFO Queue I F B A E G

Breadth First Search : 

Breadth First Search H D front H D - A A get next vertex B I F G G C FIFO Queue I F B A E G C

Breadth First Search : 

Breadth First Search D front H D - A A visit neighbors of H B I F G G C FIFO Queue I F B A E G C

Breadth First Search : 

Breadth First Search D front D - A A finished H B I F G G C FIFO Queue I F B A E G H C

Breadth First Search : 

Breadth First Search D front D - A A dequeue next vertex B I F G G C FIFO Queue I F B A E G H C

Breadth First Search : 

Breadth First Search front D - A A visit neighbors of D B I F G G C FIFO Queue I F B A E G H C

Breadth First Search : 

Breadth First Search front - A A D finished B I F G G C FIFO Queue I F B A E G H C D

Breadth First Search : 

Breadth First Search front - A A dequeue next vertex B I F G G C FIFO Queue I F B A E G H C D

Breadth First Search : 

Breadth First Search front STOP E H D - A A B I F G G C FIFO Queue I F B A G C