Data Structures and Algorithms C++ : Zero to Mastery in 2026

Understand arrays by exploring zero-based indexing, memory contiguity, and storing multiple values with a single array. Learn initialization, printing with loops, and how arrays behave when partially filled.

Learn to sum array elements in C++ by inputting n, storing values in an array, and accumulating the total with sum += a[i] before printing the result.

Learn to find the largest element in an array by reading n elements, iterating through them, and updating a running maximum initialized to minus infinity.

Learn how to swap two numbers in c++ using a temp variable, the xor trick, or the built-in swap function, with before and after demonstrations.

Learn to print an array in reverse order by iterating from the last index (n-1) down to zero and printing each element, alongside a normal left-to-right print.

Learn to reverse an array in C++ using two pointers, swapping elements at the start and end, and printing the array before and after the reversal.

Identify segmentation fault and runtime error as outcomes of accessing memory outside array bounds. Examine examples like a[2000] or a[-1] and learn how maximum array sizes around 10^5–10^6 limit allocations.

Explore strings and one-dimensional character arrays in C++. Contrast with integer arrays, and learn input/output basics, including the null terminator and how strings print until termination.

Compute the length of a string stored in a character array by iterating until the null terminator. The length function returns an integer and prints four for the example Abcd.

Master cin.getline to safely read spaces by specifying the array name and max characters, with an optional delimiter (default newline) to control where input stops, avoiding overflow and memory errors.

Learn to reverse a string in a character array using a two-pointer approach in C++, swapping from both ends until start meets end, using length and handling the null terminator.

Learn how inbuilt c-style string functions in C++ operate on character arrays: length, compare, copy, copy first n characters, and concatenate using the C string header.

learn to print prefixes of a string in c++ using nested loops, with outer end and inner start, printing from index 0 to end to produce a, ab, abc, abcd.

Learn two dimensional arrays in c++, illustrated with tic tac toe and chess, including declaring, indexing, and row-wise and column-wise input and printing.

Learn how to initialize and pass 2d arrays (matrices) in C++, using rows and columns, including partial initialization with optional rows, zeros for missing elements, and printing the array.

Learn how 2d arrays are stored in memory using row major order, mapping i and j to a 1d index with i times c plus j.

Explore the string class as an inbuilt data type, safer than character arrays. Learn creating, modifying, and comparing strings using vectors, getline, substr, find, to_string, and string-to-int conversions.

Explore object oriented programming by defining classes as blueprints and objects as real world instances, with properties and functions demonstrated through student and product examples.

Explore creating objects in C++ with static and dynamic memory, access properties using dot and arrow operators, and manage visibility with public and private access modifiers.

Explore public and private access modifiers in C++, implement getters and setters to read and write private data, and access functions via dot or arrow notation.

Explore constructors in c++: default and parameterized constructors initialize object data members, show how access modifiers affect visibility, and demonstrate constructor overloading and object creation.

Explore constructors, parameterized and default, and master the this keyword to distinguish members from parameters, ensuring proper initialization and avoiding garbage values.

Learn how a copy constructor creates a copy of an existing object by copying its values, while default constructors, copy assignment operator, and destructors are automatically provided.

Explore the copy assignment operator, copy constructor, and destructor in C++, revealing how objects copy values and how memory is deallocated for static and dynamic objects.

Explore c++ constructors by creating student objects with default and parameterized constructors (row number; age and row), and compare copy constructor with copy assignment, including the s5 = s3 case.

Develop a fraction class in C++ with private numerator and denominator, a parameterized constructor, and public methods print and add; implement addition using lcm and gcd to simplify.

Explore a fraction class with private numerator and denominator, demonstrating how pass-by-reference and const references avoid copies in add and multiply operations, keeping inputs unchanged while simplifying results.

Create a complex number class with real and imaginary parts, a parameterized constructor, plus and multiply operations, and a print function to display as real plus iota imaginary.

Explore shallow copy and deep copy in a student class, showing how copying only the address creates shared state and how to copy the entire array with string copy.

Understand how built-in copy constructors create shallow copies with dynamic arrays, and implement a deep copy using a custom copy constructor while passing by reference to avoid recursion.

Learn how initialization lists initialize constant and reference data members in C++, avoid garbage values, and use constructors to assign per-object values with proper syntax.

Learn how constant functions preserve object state in a fraction class by marking getters as constant, allowing calls on constant objects while setters remain prohibited.

Explore static properties and static data members, their class-wide behavior, access them via the class name, and initialize them outside the class to share state across objects.

Overload the plus, multiply, and equal operators for a fraction class to enable f1 + f2, f1 * f2, and f1 == f2, returning new fractions and applying simplification.

Overload the pre-increment operator for a fraction class, illustrating unary behavior and nested usage. Explain returning by reference to avoid copies and ensure correct updates.

Overload post-increment for a fraction class, illustrate pre vs post behavior, return old value, and implement plus-equal (operator +=) with nesting rules and return by reference for chaining.

Build a dynamic array class in C++ that expands by doubling capacity, supports add and get operations, handles memory safely with deep copy, and demonstrates memory management.

Explore C++ vectors as built-in dynamic arrays that resize by doubling capacity, using pushback for inserts, at for safe access, and size and capacity for efficient iteration and sorting.

Traverse a matrix in spiral order using four pointers (start row, end row, start column, end column) and a count, returning a vector of elements with O(mn) time.

Learn how selection sort sorts data in ascending order by repeatedly selecting the smallest element to the right of the current position, swapping via index tracking and implementing in C++.

Learn the bubble sort algorithm by comparing adjacent elements, swapping to push the largest values to the end, and analyzing its n squared time complexity with a practical C++ example.

Implement an optimized bubble sort that uses a flag to detect no swaps and break early, so already sorted arrays take n steps, while unsorted arrays take n^2 steps.

Learn how the c++ standard template library's inbuilt sort sorts arrays with sort(a, a+n) after including the algorithm header. Bits/stdc++.h serves as a master header including many headers.

Learn to implement linear search in an array with a key, returning the index or not found, using a C++ function and a left-to-right scan achieving O(n).

Explain the limitations of linear search, which takes n steps regardless of sorted or unsorted. Show that binary search provides log n steps for sorted arrays.

Master binary search for sorted arrays by using start, end, and mid to halve the search space, while recognizing that unsorted arrays require linear search.

Learn to implement binary search in C++: initialize start and end, compute mid safely, compare with key, adjust pointers, return index or -1; input must be sorted.