Bit++

文章目录

一、Bit++

总结

一、Bit++

本题链接：Bit++

题目：

A. Bit++

time limit per test1 second

memory limit per test256 megabytes

inputstandard input

outputstandard output

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.

Examples

inputCopy

1

++X

output

1

input

2

X++

–X

output

0

本博客给出本题截图：

AC代码

#include <iostream>
#include <string>
using namespace std;
const int N = 160;
string a[N];
int n, x;
int main()
{
  cin >> n;
  for (int i = 0; i < n; i ++ ) 
  {
    cin >> a[i];
    if (a[i][0] == '+' || a[i][a[i].size() - 1] == '+')
      x ++;
    else x --;
  }
  cout << x << endl;
  return 0;
}

题意：就是看输入的字符串中是由 + 还是 - ，有 + 就是 + 1 ，有 - 就是 - 1

总结

水题，不解释