我的 c++ 程序编译正常，但没有运行。 我的程序正在运行并停止了一段时间。 没有错误显示

Question

My c++ program is compiling with no error . I am running my program on vscode . In the same file, when i run this code.
My system:

1. Windows 10
2. visual studio code
3. c++ 14

#include<bits/stdc++.h>
using namespace std;
int main(){
count<<"Hello";
return 0;
}

It is running fine.
When in the same file, i put this code,

#include<bits/stdc++.h>
using namespace std;
int removeAlt(string s);
int removeTwo(string s,char a,char b);
int alternate(string s);

int main(){
    cout<<alternate("abaacdabd");
    return 0;
}
int removeAlt(string s){
    // remove consicutive characters
    for(int i=0;i<s.size();){
        if(s[i]==s[i+1]){
            s.erase(i,1);
        }
    }
    cout<<"Remove consitutive "<<s<<endl;
    return s.size();
}

int removeTwo(string str,char a,char b){
    for(int i=0;i<str.length();){
        char ch=str[i];
        if(str[i]==a||str[i]==b){
            str.erase(i,1);
        } else i++;
    }
    cout<<"removing "<<a<<" "<<b<<",, "<<str<<endl;
    int res=removeAlt(str);
    return res;
}

// Complete the alternate function below.
int alternate(string s) {
    set<char>st;
    // get different character of set
    for(auto x:s)
        st.insert(x);

    int len=st.size(); // length of set
    char setAr[len];
    auto it=st.begin();
    for(int i=0;i<len;i++){
        setAr[i]=*it;
        it++;
    }
    cout<<"Removing\n";
    int up=len;
    for(int i=0;i<up-1;i++){
        for(int j=i+1;j<=up;j++){
            cout<<"SetAr "<<i<<" "<<j<<endl;
            len=max(0,removeTwo(s,setAr[i],setAr[j]));
        }
    }
    return len;
}

It runs some statements, after that terminal pauses forever .

Answer 1

int removeAlt(string s){
    // remove consicutive characters
    for(int i=0;i<s.size();){
        if(s[i]==s[i+1]){
            s.erase(i,1);
        }
    }
    cout<<"Remove consitutive "<<s<<endl;
    return s.size();
}

You never increment i and so this function will run forever unless it erases everything.

Answer 2

int removeAlt(string s){
    // remove consicutive characters
    for(int i=0;i<s.size();){
        if(s[i]==s[i+1]){
            s.erase(i,1);
        } else i++;
    }
    cout<<"Remove consitutive "<<s<<endl;
    return s.size();
}

Increment i if next element is not same as current.