Code is given below

#1

#include<bits/stdc++.h>
using namespace std;
int main() {
string str;
map<char,int>m;
getline(cin,str);
int n=str.length();
for(int i=0;i<n;i++)
{
m[str[i]]++;
}
map<char,int> ::iterator itr;
for(itr=m.begin();itr!=m.end();itr++)
{
cout<first<second;
}
return 0;
}

#2

@CHANDU_0556 you need to compress only the local clusters for example if the given string was aaabbbaaa answer would be a3b3a3, but your logic would give a6b3.

#3

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