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runLengthEncoding.cpp
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runLengthEncoding.cpp
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#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
void encode(string);
void decode(string);
int main() {
ll choice ;cin>>choice;fflush(stdin);fflush(stdout);
string s;cin>>s;
switch(choice){
case 1:
encode(s);
break;
case 2:
decode(s);
break;
}
return 0;
}
void encode(string s){
for(int i=0;s[i];){
int j=i;
int count=0;
for(;s[j];j++){
if(s[i]!=s[j])break;
count ++;
}
cout<<count<<s[i];
i=j;
}
}
void decode(string s){
string ans="";
for(int i=0;s[i];){
int number=0;
int j=i;
if(isdigit(s[i])){
int count=0;
for(;s[j];j++){
if(!isdigit(s[j]))break;
number=number*10+(s[j]-'0');
}
//cout<<number<<endl;
}
if(number==0)
i++;
else{
i=j+1;
}
while(number!=0){
ans+=s[j];
number--;
}
}
cout<<ans<<endl;
}