Module: Sorting with comparator


Problem

5/11

Sorting an array of structures

Problem

Given a list of people consisting of last name and first name.  Write a program that sorts a list by last name in ascending lexicographic order.
 
Input
First, the number N — the number of people in the list (1<= N <= 100). Next, N names and surnames are written separated by a space.
 
Output
It is necessary to output an array sorted by last name in ascending lexicographic order.

Enter Output
3
Ivan Ivanov
Sidorov Petr
Kurbatov Egor
 		 Ivan Ivanov
Kurbatov Egor
Sidorov Petr
 

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

Teacher commentary

Insert the missing code snippets
C++
Write the program below 
#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

struct people {
string firstname, secondname;	
};

bool cmp(people first, people second) {   
}

int main() {


int N;

cin >> N;
vector<people> A (N);


    for(int i = 0; i < N; i++)
        cin>>A[i].firstname>>A[i].secondname;
        
    sort(A.begin(), A.end(), cmp );

    for(int i = 0;i< N; i ++)
      cout<<A[i].firstname<<" "<<A[i].secondname<<endl;

    
}

     

Program check result

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