Short Substrings

一、Short Substrings

本题链接：Short Substrings

题目：
A. Short Substrings
time limit per test2 seconds
memory limit per test256 megabytes
inputstandard input
outputstandard output
Alice guesses the strings that Bob made for her.

At first, Bob came up with the secret string a consisting of lowercase English letters. The string a has a length of 2 or more characters. Then, from string a he builds a new string b and offers Alice the string b so that she can guess the string a.

Bob builds b from a as follows: he writes all the substrings of length 2 of the string a in the order from left to right, and then joins them in the same order into the string b.

For example, if Bob came up with the string a=“abac”, then all the substrings of length 2 of the string a are: "ab", "ba", "ac". Therefore, the string b="abbaac".

You are given the string b. Help Alice to guess the string a that Bob came up with. It is guaranteed that b was built according to the algorithm given above. It can be proved that the answer to the problem is unique.

Input
The first line contains a single positive integer t (1≤t≤1000) — the number of test cases in the test. Then t test cases follow.

Each test case consists of one line in which the string b is written, consisting of lowercase English letters (2≤|b|≤100)— the string Bob came up with, where |b| is the length of the string b. It is guaranteed that b was built according to the algorithm given above.

Output
Output t answers to test cases. Each answer is the secret string a, consisting of lowercase English letters, that Bob came up with.

Example
input
4
abbaac
ac
bccddaaf
zzzzzzzzzz
output
abac
ac
bcdaf
zzzzzz

Note
The first test case is explained in the statement.

In the second test case, Bob came up with the string a="ac", the string a has a length 2, so the string b is equal to the string a.

In the third test case, Bob came up with the string a="bcdaf", substrings of length 2 of string a are:"bc", "cd", "da", "af", so the string b="bccddaaf".

本博客给出本题截图：

题意：对于一个字符串abcdef，每相邻的两个进行组合就变成了abbccddeef，现要求执行逆操作并输出

AC代码

#include <iostream>
#include <string>using namespace std;int main()
{
    int n;cin >> n;while (n -- ){
    string a;cin >> a;cout << a[0];for (int i = 1; i < a.size(); i += 2 )cout << a[i];puts("");}return 0;
}

总结

水题，不解释