Compressing strings code

#1

i am taking an array of size 256 for all possible characters. i am incrementing the value at the index of the character. then i am printing the charcter followed by the value of array at that index. after printing i am setting it as zero so that it is not printed again
#include
#include
#include
using namespace std;
int main() {
int a[256]={0};
string s; cin>>s;
char x;
for (int i=0;i<s.length();i++)
{
x=s.at(i);
a[(int)x]++;
}
int y;
for (int i=0;i<s.length();i++)
{
x=s.at(i);
y=(int)x;
if(a[y]==0) continue;
cout<<x<<a[y];
a[y]=0;

}
return 0;

}

#2

you just need to do this nothing else like setting it to zero
while(i<str.size())
{
char ch=str[i];
int count=0;
cout<<str[i];
while(ch==str[i])
{
count++;
i++;
}

 cout<<count;

}

#3

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