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std::sort in vector returns 0 instead of the values [duplicate]

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1

This question already has an answer here:

• 
  Setting vector elements in range-based for loop
  
  4 answers
  
  

Im doing a simple exercise in HackerRank, get some ints in a vector and print them sorted in the screen.

int main() 
 int sz;
 std::cin >> sz; // 5 in this case

 std::vector<int> v(sz);
 for(auto elem : v)
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4
 
 std::cout << std::endl;

 std::sort(v.begin(), v.end());

 for (auto elem : v) 
 std::cout << elem << ' '; //0 0 0 0 0 
 
 return 0;

The output is:

1 6 10 8 4 
0 0 0 0 0 

Is there something else to take in account with the std::sort? Is it a problem with HackerRank's compiler?

c++

share|improve this question

edited Mar 8 at 16:25

Pepe Moreno

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

marked as duplicate by Slava c++
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Mar 8 at 16:30

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

1

This question already has an answer here:

• 
  Setting vector elements in range-based for loop
  
  4 answers
  
  

Im doing a simple exercise in HackerRank, get some ints in a vector and print them sorted in the screen.

int main() 
 int sz;
 std::cin >> sz; // 5 in this case

 std::vector<int> v(sz);
 for(auto elem : v)
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4
 
 std::cout << std::endl;

 std::sort(v.begin(), v.end());

 for (auto elem : v) 
 std::cout << elem << ' '; //0 0 0 0 0 
 
 return 0;

The output is:

1 6 10 8 4 
0 0 0 0 0 

Is there something else to take in account with the std::sort? Is it a problem with HackerRank's compiler?

c++

share|improve this question

edited Mar 8 at 16:25

Pepe Moreno

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

marked as duplicate by Slava c++
Users with the  c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

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dismissable: false,
relativeToBody: true
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);
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);
Mar 8 at 16:30

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

This question already has an answer here:

• 
  Setting vector elements in range-based for loop
  
  4 answers
  
  

Im doing a simple exercise in HackerRank, get some ints in a vector and print them sorted in the screen.

int main() 
 int sz;
 std::cin >> sz; // 5 in this case

 std::vector<int> v(sz);
 for(auto elem : v)
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4
 
 std::cout << std::endl;

 std::sort(v.begin(), v.end());

 for (auto elem : v) 
 std::cout << elem << ' '; //0 0 0 0 0 
 
 return 0;

The output is:

1 6 10 8 4 
0 0 0 0 0 

Is there something else to take in account with the std::sort? Is it a problem with HackerRank's compiler?

c++

share|improve this question

edited Mar 8 at 16:25

Pepe Moreno

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

int main() 
 int sz;
 std::cin >> sz; // 5 in this case

 std::vector<int> v(sz);
 for(auto elem : v)
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4
 
 std::cout << std::endl;

 std::sort(v.begin(), v.end());

 for (auto elem : v) 
 std::cout << elem << ' '; //0 0 0 0 0 
 
 return 0;

1 6 10 8 4 
0 0 0 0 0 

share|improve this question

edited Mar 8 at 16:25

Pepe Moreno

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

share|improve this question

edited Mar 8 at 16:25

Pepe Moreno

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

asked Mar 8 at 16:19

Pepe MorenoPepe Moreno

614

1 Answer
1

active

oldest

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6

elem is a copy of the items in your vector! Change it to be a reference so you'll actually be modifying the vector when reading in values:

for(auto &elem : v)
// ^^^
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4

See it work here: ideone

share|improve this answer

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes it was that, thanks!
  
  – Pepe Moreno
  Mar 8 at 16:25
  

  
  
  
  

add a comment | 

6

elem is a copy of the items in your vector! Change it to be a reference so you'll actually be modifying the vector when reading in values:

for(auto &elem : v)
// ^^^
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4

See it work here: ideone

share|improve this answer

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes it was that, thanks!
  
  – Pepe Moreno
  Mar 8 at 16:25
  

  
  
  
  

add a comment | 

6

elem is a copy of the items in your vector! Change it to be a reference so you'll actually be modifying the vector when reading in values:

for(auto &elem : v)
// ^^^
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4

See it work here: ideone

share|improve this answer

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes it was that, thanks!
  
  – Pepe Moreno
  Mar 8 at 16:25
  

  
  
  
  

add a comment | 

elem is a copy of the items in your vector! Change it to be a reference so you'll actually be modifying the vector when reading in values:

for(auto &elem : v)
// ^^^
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4

See it work here: ideone

share|improve this answer

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

for(auto &elem : v)
// ^^^
 std::cin >> elem;
 std::cout << elem << ' '; //1 6 10 8 4

share|improve this answer

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

answered Mar 8 at 16:22

scohe001scohe001

8,32212442

answered Mar 8 at 16:22

scohe001scohe001

8,32212442