URI Online Judge Solution 1068 Parenthesis Balance I

URI Online Judge Solution 1068 Parenthesis Balance I using Python Programming Language.

Considering an expression with parenthesis, print a message informing if the among of parenthesis is correct or incorrect, without considering the rest of the expression. Example:

a+(b*c)-2-a is correct
(a+b*(2-c)-2+a)*2 is correct

when

(a*b-(2+c)         is incorrect
2*(3-a))           is incorrect
)3+b*(2-c)(        is incorrect

Resuming, all closing parenthesis must have an open parenthesis and it's not possible a closing parenthesis without a previous open parenthesis, and the quantity of closing and open parenthesis must be the same.

Input

The input file contains N expressions (1 <= N <= 10000), each one with up to 1000 characters.

Output

The output must be correct or incorrect for each test case according with above rules.

Input Sample	Output Sample
a+(bc)-2-a (a+b(2-c)-2+a)2 (ab-(2+c) 2(3-a)) )3+b(2-c)(	correct correct incorrect incorrect incorrect

Solution using Python :

while True:
    try:
        List1 = input()
        List2 = []
        correct = False
        P1 = 0
        P2 = 0
        for v in List1:
            if (v == '('):
                P1 += 1
                List2.append(v)
            if (v == ')'):
                P2 += 1
                List2.append(v)
        if(len(List2)%2 != 0):
            correct = False
        else:
            if(List2[0] == ')'):
                correct = False
            else:
                if (List2[len(List2) - 1] == '('):
                    correct = False
                else:
                    if (P1 != P2):
                        correct = False
                    else:
                        correct = True
        if(correct):
            print("correct")
        else:
            print("incorrect")
    except (EOFError):
        break

Comments

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