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To find the first repeating element in an array, you can use a hash map to keep track of the frequency of each element while traversing the array. As soon as you encounter an element with a frequency greater than one, it means it is the first repeating element.
Here's the C++ code to find the first repeating element in an array:
cppCopy code
#include <iostream> #include <vector> #include <unordered_map> int findFirstRepeatingElement(std::vector<int>& nums) { std::unordered_map<int, int> frequencyMap; for (int num : nums) { frequencyMap[num]++; } for (int num : nums) { if (frequencyMap[num] > 1) { return num; } } return -1; // No repeating element found } int main() { std::vector<int> nums = {3, 1, 4, 2, 1, 5, 3}; int firstRepeatingElement = findFirstRepeatingElement(nums); if (firstRepeatingElement != -1) { std::cout << "First repeating element: " << firstRepeatingElement << std::endl; } else { std::cout << "No repeating element found." << std::endl; } return 0; }
Example Output:
mathematicaCopy code
First repeating element: 3
In this code, the
findFirstRepeatingElement
function calculates the frequency of each element using a hash map and then checks for the first repeating element in the array. The time complexity of this approach is O(n), where n is the number of elements in the array.
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