📘 Lesson · Lesson 74

STL Overview

What is the STL?

💡 Note

The STL (Standard Template Library) provides ready-made containers (vector, map, set), algorithms (sort, find) and iterators.

Main Parts

Containers — vector, list, map, set, stack, queue.
Algorithms — sort, find, count, reverse.
Iterators — move through containers.

Example

C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
    vector<int> v = {5, 2, 8, 1};
    sort(v.begin(), v.end());   // STL algorithm
    for (int x : v) cout << x << " ";   // 1 2 5 8
    return 0;
}

Output:
1 2 5 8

Summary

STL = containers + algorithms + iterators, ready to use.
Saves time vs writing data structures from scratch.

STL क्या है?

💡 Note

STL (Standard Template Library) ready-made containers (vector, map, set), algorithms (sort, find) और iterators देती है।

मुख्य भाग

Containers — vector, list, map, set, stack, queue।
Algorithms — sort, find, count, reverse।
Iterators — containers में घूमते हैं।

Example

C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
    vector<int> v = {5, 2, 8, 1};
    sort(v.begin(), v.end());   // STL algorithm
    for (int x : v) cout << x << " ";   // 1 2 5 8
    return 0;
}

Output:
1 2 5 8

सारांश

STL = containers + algorithms + iterators, ready to use।
Data structures खुद लिखने से समय बचाता है।

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