Quick Answer

Containers, algorithms, and iterators for efficient programming.

Understanding the Issue

The STL provides generic containers (vector, map), algorithms (sort, find), and iterator patterns that eliminate manual data structure implementations.

The Problem

This code demonstrates the issue:

Cpp Error 
// Problem: Manual operations
int arr[100];
for(int i=0; i<100; i++) arr[i] = i*i;

The Solution

Here's the corrected code:

Cpp Fixed 
// Solution: STL approach
vector<int> v(100);
iota(v.begin(), v.end(), 0);
transform(v.begin(), v.end(), v.begin(),
    [](int x) { return x*x; });

Key Takeaways

Prefer STL over manual implementations for maintainability.