[BaekJoon] - 10845 큐

 

10845번: 큐

 

#!/bin/python3

def pop(q):
    if len(q):
        return q.pop(0)
    else:
        return -1

def size(q):
    return len(q)

def empty(q):
    if len(q):
        return 0
    else:
        return 1

def front(q):
    if len(q):
        return q[0]
    else:
        return -1

def back(q):
    if len(q):
        return q[len(q)-1]
    else:
        return -1
    
def push(q, op):
    q.append(op)

if __name__ == "__main__":
    queue = list()
    operation = list()
    count = int(input(""))
    
    while count > 0:
        operation.append(input("").split(" "))
        count -= 1
        
    for op in operation:
        if len(op) == 1:
            if op[0] == "pop":
                print(pop(queue))
            elif op[0] == "size":   
                print(size(queue))
            elif op[0] == "empty":
                print(empty(queue))
            elif op[0] == "front":
                print(front(queue))
            elif op[0] == "back":
                print(back(queue))
        else:
            push(queue, op[1])