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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. vector<int> evenNumbers(vector<int> arr, int n) {
  6.   vector<int> ans;
  7.   for(int i = arr.size() - 1; i >= 0; i--) {
  8.     if(ans.size() == n) break;
  9.     if(arr[i] % 2 == 0) ans.insert(ans.begin(), arr[i]);
  10.   }
  11.   return ans;
  12. }
  13.  
  14. int main() {
  15.   // Test cases
  16.   vector<int> test1 = {1, 2, 3, 4, 5, 6, 7, 8, 9};
  17.   vector<int> test2 = {9, 7, 5, 3, 2, 4, 6, 8};
  18.   vector<int> test3 = {2, 2, 2, 2, 2};
  19.  
  20.   // Test 1: Get last 3 even numbers
  21.   vector<int> result1 = evenNumbers(test1, 3);
  22.   cout << "Test 1: ";
  23.   for(int num : result1) cout << num << " ";
  24.   cout << endl;  // Expected: 4 6 8
  25.  
  26.   // Test 2: Get last 2 even numbers
  27.   vector<int> result2 = evenNumbers(test2, 2);
  28.   cout << "Test 2: ";
  29.   for(int num : result2) cout << num << " ";
  30.   cout << endl;  // Expected: 6 8
  31.  
  32.   // Test 3: Get last 3 even numbers (all same)
  33.   vector<int> result3 = evenNumbers(test3, 3);
  34.   cout << "Test 3: ";
  35.   for(int num : result3) cout << num << " ";
  36.   cout << endl;  // Expected: 2 2 2
  37.  
  38.   return 0;
  39. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin
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Standard input is empty
stdout
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Test 1: 4 6 8 
Test 2: 6 8 
Test 3: 2 2 2
https://ideone.com/XQP9D4
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
public

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