The classic programming language of Bitland is Bit++. This language is so peculiar and complicated.The language is that peculiar as it has exactly one variable, called x. Also, there are two operations:Operation ++ increases the value of variable x by 1.Operation -- decreases the value of variable x by 1.A statement in language Bit++ is a sequence, consisting of exactly one operation and one variable x. The statement is written without spaces, that is, it can only contain characters "+", "-", "X". Executing a statement means applying the operation it contains.A programme in Bit++ is a sequence of statements, each of them needs to be executed. Executing a programme means executing all the statements it contains.You're given a programme in language Bit++. The initial value of x is 0. Execute the programme and find its final value (the value of the variable when this programme is executed).InputThe first line contains a single integer n (1 ≤ n ≤ 150) — the number of statements in the programme.Next n lines contain a statement each. Each statement contains exactly one operation (++ or --) and exactly one variable x (denoted as letter «X»). Thus, there are no empty statements. The operation and the variable can be written in any order.OutputPrint a single integer — the final value of x.
Question
The classic programming language of Bitland is Bit++. This language is so peculiar and complicated.The language is that peculiar as it has exactly one variable, called x. Also, there are two operations:Operation ++ increases the value of variable x by 1.Operation -- decreases the value of variable x by 1.A statement in language Bit++ is a sequence, consisting of exactly one operation and one variable x. The statement is written without spaces, that is, it can only contain characters "+", "-", "X". Executing a statement means applying the operation it contains.A programme in Bit++ is a sequence of statements, each of them needs to be executed. Executing a programme means executing all the statements it contains.You're given a programme in language Bit++. The initial value of x is 0. Execute the programme and find its final value (the value of the variable when this programme is executed).InputThe first line contains a single integer n (1 ≤ n ≤ 150) — the number of statements in the programme.Next n lines contain a statement each. Each statement contains exactly one operation (++ or --) and exactly one variable x (denoted as letter «X»). Thus, there are no empty statements. The operation and the variable can be written in any order.OutputPrint a single integer — the final value of x.
Solution
To solve this problem, you need to follow these steps:
-
Initialize a variable
xto 0. This will hold the current value of the variablexin the Bit++ program. -
Read the number of statements
nfrom the input. This is the number of operations that will be performed onx. -
Loop over the range
n. For each iteration, do the following:a. Read the next statement from the input.
b. If the statement contains the operation '++', increase the value of
xby 1.c. If the statement contains the operation '--', decrease the value of
xby 1. -
After all statements have been processed, print the final value of
x.
Here is a Python code snippet that implements these steps:
x = 0
n = int(input())
for _ in range(n):
statement = input()
if '++' in statement:
x += 1
elif '--' in statement:
x -= 1
print(x)
This code reads the number of statements, then processes each statement in turn. If the statement contains '++', it increments x; if the statement contains '--', it decrements x. Finally, it prints the final value of x.
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