Quick Answer

Optimal vector initialization for performance and readability.

Understanding the Issue

Different initialization methods serve different purposes - from list initialization to move semantics. Choosing the right approach impacts performance.

The Problem

This code demonstrates the issue:

Cpp Error 
// Problem: C-style initialization
int arr[] = {1,2,3};
vector<int> v(arr, arr+3); // Old-style

The Solution

Here's the corrected code:

Cpp Fixed 
// Solution 1: Direct list init (C++11)
vector<int> v1 = {1, 2, 3};

// Solution 2: Fill constructor
vector<int> v2(5, 100); // 5 elements of 100

Key Takeaways

Prefer modern initialization styles for cleaner code.