A. Bit++
time limit per test: 1 second
memory limit per test: 256 megabytes
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).
Input
The 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.
Output
Print a single integer — the final value of x.
Example 1
| Input |
|---|
| 1 |
| ++X |
| Output |
|---|
| 1 |
Example 2
| Input |
|---|
| 2 |
| X++ |
| --X |
| Output |
|---|
| 0 |
Solution
Try to solve it on your own before looking at the solution.
Python3 / Python2 / PyPy / ...
# Leer número de instrucciones
n = int(input().strip())
# Valor inicial
x = 0
# Procesar cada instrucción
for _ in range(n):
statement = input().strip()
if "++" in statement:
x += 1
else:
x -= 1
# Imprimir resultado final
print(x)You are welcome to share your solution in another programming language