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C++ code to find palindrome string whose substring is S
Suppose we have a string S with n letters. We have to find another string T, such that T is palindrome and S is subsequence of T.
So, if the input is like S = "ab", then the output will be "aabaa" (other answers are also available)
Steps
To solve this, we will follow these steps −
res := S reverse the array S res := res + S return res
Example
Let us see the following implementation to get better understanding −
#include <bits/stdc++.h> using namespace std; string solve(string S){ string res = S; reverse(S.begin(), S.end()); res += S; return res; } int main(){ string S = "ab"; cout << solve(S) << endl; }
Input
ab
Output
abba
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