Official
A - Echo Editorial by en_translator
For beginners
- If you are new to learning programming and do not know where to start, please try Problem A "Welcome to AtCoder" from practice contest. There you can find a sample code for each language.
- Also, if you are not familiar with problems in programming contests, we recommend you to try some problems in "AtCoder Beginners Selection".
- 「競プロ典型 90 問」(Typical 90 Problems of Competitive Programming) is a collection of typical 90 competitive programming problems; unfortunately, currently the problem statements are all Japanese.
- 「C++入門 AtCoder Programming Guide for beginners (APG4b)」 is a C++ tutorial for competitive programmers. Sadly, this is only in Japanese too.
One can define a variable that stores the string to be printed, but in the competitive programming, all that required is a correct output, so you can slack off and implement the following:
- Iterate each character of \(S\) with a for statement and print it twice.
Here, you must be careful not to print unnecessary spaces or newlines.
Sample codes (C++):
#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
string s;
cin >> n >> s;
for(int i=0;i<n;i++){
cout << s[i] << s[i];
}cout << "\n";
return 0;
}
#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
string s;
cin >> n >> s;
for(auto &letter : s){
cout << letter << letter;
}cout << "\n";
return 0;
}
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