Keep output and input from alternating? - c++

Question

I am very new to coding, and have been practicing with some easy problems at codeforces.com. I was working on this problem, but it seemed to be asking for the input (all at once) yielding the output (all at once). I can only figure out how to get one output at a time.
Here are the basic instructions for the problem:
Input
The first line contains an integer n (1 ≤ n ≤ 100). Each of the following n lines contains one word. All the words consist of lowercase Latin letters and possess the lengths of from 1 to 100 characters.
Output
Print n lines. The i-th line should contain the result of replacing of the i-th word from the input data.
Examples
input
4
word
localization
internationalization
pneumonoultramicroscopicsilicovolcanoconiosis
output
word
l10n
i18n
p43s
Here is my code:
#include <iostream>
#include <string>
using namespace std;
void wordToNumbers(string word){
int midLetters = word.length();
char firstLetter = word.front();
char lastLetter = word.back();
cout <<firstLetter <<(midLetters-2) <<lastLetter <<endl;
}
int main(){
string wordInput;
string firstNum;
getline(cin,firstNum);
int i = stoi(firstNum);
for(i>=1; i--;){
getline(cin,wordInput);
if (wordInput.length() > 10){
wordToNumbers(wordInput);
} else {
cout <<wordInput <<endl;
}
}
return 0;
}

Answer 1

it's perfectly fine to read and print output for the lines one by one.
Exactly your solution accepted: http://codeforces.com/contest/71/submission/16659519

Answer 2

I'm also a beginner in c++. My idea would be to save every line first in a buffer and then write everything to std::cout.
I use a std::vector as the buffer, cause IMO it is simple to understand and very useful in many cases. Basically it is a better array. You can read more about std::vector here.
#include <iostream>
#include <string>
//for use of std::vector container
#include <vector>
using namespace std;
void wordToNumbers(string word){
int midLetters = word.length();
char firstLetter = word.front();
char lastLetter = word.back();
cout <<firstLetter <<(midLetters-2) <<lastLetter <<endl;
}
int main(){
string wordInput;
string firstNum;
//container for buffering all our strings
vector<string> bufferStrings;
getline(cin,firstNum);
int i = stoi(firstNum);
//read line by line and save every line in our buffer-container
for(i>=1; i--;){
getline(cin,wordInput);
//append the new string to our buffer
bufferStrings.push_back(wordInput);
}
//now iterate through the buffer and write everything to cout
for(int index = 0; index < bufferStrings.size(); ++index) {
if (bufferStrings[index].length() > 10){
wordToNumbers(bufferStrings[index]);
} else {
cout <<bufferStrings[index] <<endl;
}
}
return 0;
}
Probably this is not the best or most beautiful solution, but it should be easy to understand :)