Get subsequence
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#include <iostream>
#include <vector>
using namespace std;
void util(string s , int idx , string ans , vector<string> &res){
if(idx == s.length()){
res.push_back(ans);
return;
}
char current = s[idx];
util(s, idx+1 , ans , res);
util(s,idx+1, ans + current , res);
}
int main() {
string s = "abc";
vector<string> res;
util(s, 0, "",res);
for(int i=0 ; i<res.size() ; i++){
cout<<res[i]<<" ";
}
}
Cpp
INFO