🔴 Advanced · Lesson 59

STL Algorithms

What is STL Algorithms?

STL Algorithms
STL algorithms perform common operations such as sorting, searching, counting and reversing on containers.

Level
🔴 STL, Modern C++ and Projects

Example File
algorithms.cpp

Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

It helps you write correct and readable C++ programs.
It is used repeatedly in school practicals, projects and competitive programming.
It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

Term	Meaning / Use
sort	STL Algorithms programming में Sort use होता है।
find	STL Algorithms programming में Find use होता है।
count	STL Algorithms programming में Count use होता है।
reverse	STL Algorithms programming में Reverse use होता है।
binary_search	STL Algorithms programming में Binary_search use होता है।

Syntax / Pattern

C++

sort(v.begin(), v.end());

Example Program

main.cpp

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    vector<int> v = {4,2,9};
    reverse(v.begin(), v.end());
    for(int x:v) cout << x << " ";
}

Expected Output

9 2 4

Program Explanation

reverse() reverses the order of elements.
Range is given using begin() and end().

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

data processing
competitive programming
clean code

Common Mistakes

Forgetting <algorithm>.
Using binary_search without sorting first.

Practice Tasks

Sort names alphabetically.
Find whether value exists in vector.

Summary

STL Algorithms एक ज़रूरी C++ topic है। परिभाषा सीखें, syntax समझें, example program चलाएं और फिर practice tasks हल करके concept मज़बूत करें।

STL Algorithms क्या है?

STL Algorithms
STL algorithms perform common operations such as sorting, searching, counting and reversing on containers.

Level
🔴 STL, Modern C++ and Projects

Example File
algorithms.cpp

मुख्य फोकस
Concept + syntax + practical C++ program

इसे क्यों सीखें?

यह आपको सही और पढ़ने-योग्य C++ programs लिखने में मदद करता है।
यह school practicals, projects और competitive programming में बार-बार use होता है।
यह OOP, STL और data structures जैसे advanced topics की नींव बनाता है।

ज़रूरी Terms

Term	अर्थ / उपयोग
sort	Sort STL Algorithms programming में use होता है।
find	Find STL Algorithms programming में use होता है।
count	Count STL Algorithms programming में use होता है।
reverse	Reverse STL Algorithms programming में use होता है।
binary_search	Binary_search STL Algorithms programming में use होता है।

Syntax / Pattern

C++

sort(v.begin(), v.end());

Example Program

main.cpp

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    vector<int> v = {4,2,9};
    reverse(v.begin(), v.end());
    for(int x:v) cout << x << " ";
}

Expected Output

9 2 4

Program Explanation

reverse() reverses the order of elements.
Range is given using begin() and end().

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

data processing
competitive programming
clean code

आम गलतियाँ (Common Mistakes)

Forgetting <algorithm>.
Using binary_search without sorting first.

अभ्यास (Practice Tasks)

Sort names alphabetically.
Find whether value exists in vector.

सारांश

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