我正在尝试创建一个程序,以便在输入诸如“cccaaaattt”之类的字符串时输出将是“cat”
到目前为止,这是我的代码:
#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
int main(array<System::String ^> ^args)
{
string str = "";//create an empty string variable named str
std::cout << "What word do you want to remove duplicate characters from?";
cin >> str; //fill the str variable with the word the user whants to remove duplicate consecutive characters from
char current;//create a new char variable named current
char lastChar;//create a new char variable named lastChar for the previos character in the string
for (int i = 1; i < str.length(); i++){ //iterate through until it reaches the end of the string
lastChar = str[i - 1]; //set lastChar to the previos char in the string
current = str[i];//set current to the current char in the string
if (lastChar == current){//if the lastChar and the current are equal (the string has two consecutive characters
str.erase(i,1);//erase the current character
}
}
cout << str << endl; //display the new string
system("pause");
return 0;
}
我评论了我认为代码会做的事情。
它不会删除正确数量的字符,使我的输出“ccaatt”
感谢您的帮助。
答案 0 :(得分:5)
在C ++中执行此操作的一种非常简单有效的方法是使用算法库中的std::unique
和erase
的std::string
函数。
#include <iostream>
#include <string>
#include <algorithm>
int main()
{
std::string x("xxbbbbccccczzzzxxxx");
x.erase(std::unique(x.begin(), x.end()), x.end());
std::cout << x << "\n";
}
这将输出:
xbczx
答案 1 :(得分:2)
虽然使用std::unique
执行此作业,但您的错误是您在erase
之后增加了计数器。固定的实现:
for (int i = 1; i < str.length(); /* No increment here */ ) {
if (str[i - 1] == str[i]) {
str.erase(i, 1);
} else {
++i;
}
}