# HackerRank String Construction Solution

#### ByBrokenprogrammers

Dec 13, 2022

Hello Programmers, In this post, you will Know how to solve HackerRank String Construction Solution. This problem is a part of the HackerRank Algorithms Series.

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. If you find any difficulty after trying several times, then you can look for solutions.

## HackerRank String Construction Solution

Amanda has a string of lowercase letters that she wants to copy to a new string. She can perform the following operations with the given costs. She can perform them any number of times to construct a new string p:

• Append a character to the end of string p at a cost of 1 dollar.
• Choose any substring of p and append it to the end of p at no charge.

Given n strings s[i], find and print the minimum cost of copying each s[i] to p[i] on a new line.

For example, given a string s = abcabc, it can be copied for 3 dollars. Start by copying ab and c individually at a cost of 1 dollar per character. String p = abc at this time. Copy p[0 : 2] to the end of p at no cost to complete the copy.

Function Description

Complete the stringConstruction function in the editor below. It should return the minimum cost of copying a string.

stringConstruction has the following parameter(s):

• s: a string

### Input Format

The first line contains a single integer n, the number of strings.
Each of the next n lines contains a single string, s[i].

### Constraints

• 1 <= n <= 5
• 1 <= |s[i]| <= 105

• 1 <= |s[i]| <= 103 for 45% of the maximum score.

### Output Format

For each string s[i] print the minimum cost of constructing a new string p[i] on a new line.

Sample Input

2
abcd
abab

Sample Output

4
2

Explanation

Query 0: We start with s = “abcd and p = “”.

1. Append character a to p at a cost of 1 dollar, p = “a.
2. Append character b to p at a cost of 1 dollar, p = “ab.
3. Append character c to p at a cost of 1 dollar, p = “abc.
4. Append character d to p at a cost of 1 dollar, p = “abcd”.

Because the total cost of all operations is 1 + 1 + 1 + 1 = 4 dollars, we print 4 on a new line.

Query 1: We start with s = “abab” and p = “”.

1. Append character ‘a’ to p at a cost of 1 dollar, p = “a.
2. Append character ‘b’ to p at a cost of 1 dollar, p = “ab.
3. Append substring “ab” to p at no cost, p = “abab”.

Because the total cost of all operations is 1 + 1 = 2 dollars, we print 2 on a new line.

Note

A substring of a string S is another string S that occurs “in” S (Wikipedia). For example, the substrings of the string “abc” are “a“, “b” ,”c“, “ab“, “bc“, and “abc“.

## HackerRank String Construction Solution

### HackerRank String Construction Solution in C

```#include <stdio.h>
#include <string.h>
int main(void) {
int t;scanf("%d",&t);
while(t--)
{	char inp[100005];
int i,c=0,l,arr[26];
for(i=0;i<26;i++)arr[i]=0;
scanf("%s",inp);
l=strlen(inp);
for(i=0;i<l;i++)
{
arr[inp[i]-'a']+=1;
}
for(i=0;i<26;i++)
if(arr[i]!=0)
c+=1;
printf("%d\n",c);}
return 0;
}
```

### HackerRank String Construction Solution in Cpp

```#include <cmath>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
long t;
cin>>t;
while(t--)
{long r=0;
string s;
cin>>s;
vector<char> m;
for(long i=0;i<s.length();++i)
{
if(find(m.begin(),m.end(),s[i])==m.end()) m.push_back(s[i]);

}
cout<<m.size()<<endl;
}
return 0;
}```

### HackerRank String Construction Solution in Java

```import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
for(int a0 = 0; a0 < n; a0++){
String s = in.next();

Set<Character> uniqueChars = new HashSet<>();
for(char c : s.toCharArray())
{
}
System.out.println(uniqueChars.size());
}
}
}```

### HackerRank String Construction Solutions in Python

```import sys
def stringConstruction(s):
return len(set(s))

if __name__ == "__main__":
q = int(input().strip())
for a0 in range(q):
s = input().strip()
result = stringConstruction(s)
print(result)```

### HackerRank String Construction Solutions using JavaScript

```process.stdin.resume();
process.stdin.setEncoding('ascii');
var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;
process.stdin.on('data', function (data) {
input_stdin += data;
});
process.stdin.on('end', function () {
input_stdin_array = input_stdin.split("\n");
main();
});
return input_stdin_array[input_currentline++];
}
/////////////// ignore above this line ////////////////////
function main() {
for(var a0 = 0; a0 < n; a0++){
var m = {};
var ans = 0;
for (var i = 0; i < s.length; i++) {
if (!m[ s[i]  ]) ans++;
m[ s[i] ] = true;

}
console.log(ans)
}
}```

### HackerRank String Construction Solutions in Scala

```import scala.io.StdIn._
object Solution {

def main(args: Array[String]) {
(1 to t).foreach(_ => {
println(str.groupBy(identity).size)
})
}
}```

### HackerRank String Construction Solutions in Pascal

```var s:ansistring;
t,sl,i,j:longint;
c:char;
gt:array['a'..'z'] of longint;
begin
for i:=1 to t do
begin
for c:='a' to 'z' do gt[c]:=0;
for j:=1 to length(s) do gt[s[j]]:=1;
sl:=0;
for c:='a' to 'z' do sl:=sl+gt[c];
writeln(sl);
end;
end.
```

Disclaimer: This problem (String Construction) is generated by HackerRank but the Solution is Provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.