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  1  # include <bits stdc++.h>
  2  using namespace std;
  3  int main(){
  4      int t;
  5      cin>>t;
  6      while(t>0){
  7          int n,x;
  8          cin>>n;
  9          vector<vector<int>>a;
 10          for(int i=0;i<n;i++){
 11   vector<int> v;
 12              for(int j=0;j<n-1;j++){
 13   cin>>x;
 14                  v.push_back(x);
 15              }
 16              a.push_back(v);
 17          }
 19          vector<int>ans;
 20          for(int i=1;i<n;i++){
 21   if(a[0][i]==a[0][i-1]){
 22   ans.push_back(a[0][i]);
 23   break;
 24   }
 25   }
 26   for(int i=1;i<n-1;i++){
 27   j=0;j<n;j++){
 28   if(a[i][j]!=ans[i-1]){
 29   ans.push_back(a[i][j]);
 30   cout<<ans[i]<<" ";
 31   cout<<endl;
 32   t--;
 33   }
 34  }

What I have tried:

what is the error in my code it is not printing the answer.
Updated 30-Jan-23 8:57am
Patrice T 30-Jan-23 13:11pm    
Your code have been corrupted in question.
0x01AA 30-Jan-23 14:22pm    
"what is the error in my code it is not printing the answer."
Which of the about 5 ones?

Start here: Replace # include <bits stdc++.h> by
#include <iostream>
#include <vector>

After all that, have a look to line 27.

And so on and so on.

1 solution

The reason it doesn't give you an answer is simple: it doesn't compile.
26   for(int i=1;i<n-1;i++){
27   j=0;j<n;j++){
28   if(a[i][j]!=ans[i-1]){
What is the middle of those three lines doing there?

If C++ doesn't compile without errors, an EXE file isn't produced, so whatever you are running isn't your latest code - so it's doesn't produce the answer you expected at all.

should expect to get syntax errors every day, probably many times a day while you are coding - we all do regardless of how much experience we have! Sometimes, we misspell a variable, or a keyword; sometimes we forget to close a string or a code block. Sometimes the cat walks over your keyboard and types something really weird. Sometimes we just forget how many parameters a method call needs.

We all make mistakes.

And because we all do it, we all have to fix syntax errors - and it's a lot quicker to learn how and fix them yourself than to wait for someone else to fix them for you! So invest a little time in learning how to read error messages, and how to interpret your code as written in the light of what the compiler is telling you is wrong - it really is trying to be helpful!

So read this: How to Write Code to Solve a Problem, A Beginner's Guide Part 2: Syntax Errors[^] - it should help you next time you get a compilation error!
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