How to solve it

#1

Hi, how am i supposed to solve this question without using vectors since we have not studied it yet?

#2

@Parikalp10 hey you can use array, you can always use array in place of vector.
Use an array and custom comparator to solve this question.
If this resolves your doubt mark it as resolved.

#3

Is there any way to convert them into a string and use the compare function or do i have to use the append method in arrays?

#4

Can someone tell me why this is not working https://ide.codingblocks.com/s/234395

#5

@Parikalp10
Hey you were passing string by value which causes extra overhead , always pass parameters in comp as const and by reference unless you specifically want to make changes.
Also you were not using the compare function in write way.

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
bool comp(const string & a,const string& b){
	string X=a+b;
	string Y=b+a;
		return X>Y;
	}

int main() {
	int t,n,i,j;
	string a[100000];
	cin>>t;
	for(i=0;i<t;i++){
		cin>>n;
		for(j=0;j<n;j++){
			cin>>a[j];
		}
		sort(a,a+n,comp);
		for(j=0;j<n;j++){
			cout<<a[j];
		}
		cout<<endl;
	}
	return 0;
}

If this resolves your doubt mark it as resolved.

#6

Thank you for this but I dont know about const? Any help on that

#7

@Parikalp10 writing const before the parameter makes it constant in the function, you would not be able to modify it.

#8

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