Top 100 MNC Prep

Personalized checklist with per-section progress

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Getting Started

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Problems

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Introduction to Top 100 codesOpen

ASCII TableGoogle

Positive or Negative numberGoogle

Even or Odd numberGoogle

Sum of First N Natural numbersGoogle

Sum of N natural numbersGoogle

Sum of numbers in a given rangeGoogle

Greatest of two numbersGoogle

Greatest of the Three numbersGoogle

Leap year or notGoogle

Prime numberGoogle

Prime number within a given rangeGoogle

Sum of digits of a numberGoogle

Reverse of a numberGoogle

Palindrome numberGoogle

Armstrong numberGoogle

Armstrong number in a given rangeGoogle

Fibonacci Series upto nth termGoogle

Find the Nth Term of the Fibonacci SeriesGoogle

Factorial of a numberGoogle

Power of a numberGoogle

Factor of a numberGoogle

Finding Prime Factors of a numberGoogle

Strong numberGoogle

Perfect numberGoogle

Perfect SquareGoogle

Automorphic numberGoogle

Harshad numberGoogle

Abundant numberGoogle

Friendly pairGoogle

Working with Numbers

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Problems

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Highest Common Factor (HCF)Google

Lowest Common Multiple (LCM)Google

Greatest Common DivisorGoogle

Binary to Decimal conversionGoogle

Octal to Decimal conversionGoogle

Hexadecimal to Decimal conversionGoogle

Decimal to Binary conversionGoogle

Decimal to Octal ConversionGoogle

Decimal to Hexadecimal ConversionGoogle

Binary to Octal conversionGoogle

Octal to Binary conversionGoogle

Quadrants in which a given coordinate liesGoogle

Permutations (n people, r seats)Google

Maximum number of handshakesGoogle

Addition of two fractionsGoogle

Replace all 0’s with 1 in a given integerGoogle

Can a number be expressed as a sum of two prime numbersGoogle

Count possible decoding of a given digit sequenceGoogle

Calculate the area of a circleGoogle

Find the prime numbers between 1 to 100Google

Calculate the number of digits in an integerGoogle

Convert digit/number to wordsGoogle

Counting number of days in a given month of a yearGoogle

Finding number of times x digit occurs in a given inputGoogle

Finding number of integers which has exactly x divisorsGoogle

Finding roots of a quadratic equationGoogle

Codes for Recursion

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Problems

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Power of a NumberGoogle

Prime NumberGoogle

Largest element in an arrayGoogle

Smallest element in an arrayGoogle

Reversing a NumberGoogle

HCF of two numbers using RecursionGoogle

LCM of two numbersGoogle

Program to calculate length of the string using recursionGoogle

Print All Permutations of a StringGoogle

Given an integer N, print the F(N)th termGoogle

Given a list of N integers, print sums of all subsetsGoogle

Last non-zero digit in factorialGoogle

Given N, return the Nth row of Pascal’s triangleGoogle

Generate all combinations of balanced parenthesesGoogle

Find Factorial using recursionGoogle

Find all possible Palindromic partitions of a stringGoogle

Find all N-bit binary numbers having ≥ as many 1’s as 0’sGoogle

Given a set of positive integers, find all subsetsGoogle

Remove adjacent duplicate characters recursivelyGoogle

Important Codes related to Arrays

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Problems

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Find Largest element in an arrayGoogle

Find Smallest element in an arrayGoogle

Find the Smallest and largest element in an arrayGoogle

Find Second Smallest Element in an arrayGoogle

Calculate the sum of elements in an arrayGoogle

Reverse an ArrayGoogle

Sort first half ascending & second half descendingGoogle

Sort the elements of an arrayGoogle

Finding frequency of elements in an arrayGoogle

Sorting elements of an array by frequencyGoogle

Finding the Longest Palindrome in an ArrayGoogle

Counting Distinct Elements in an ArrayGoogle

Finding Repeating elements in an ArrayGoogle

Finding Non Repeating elements in an ArrayGoogle

Removing Duplicate elements from an arrayGoogle

Finding Minimum scalar product of two vectorsGoogle

Finding Maximum scalar product of two vectors in an arrayGoogle

Counting number of even and odd elements in an arrayGoogle

Find all Symmetric pairs in an arrayGoogle

Find maximum product sub-arrayGoogle

Finding if Arrays are disjointGoogle

Determine if array is subset of another arrayGoogle

Determine can all numbers in array be made equalGoogle

Finding Minimum sum of absolute differenceGoogle

Sort array by another array’s orderGoogle

Replace each element by its rankGoogle

Finding equilibrium indexGoogle

Rotation of elements — left and rightGoogle

Block swap algorithm for array rotationGoogle

Juggling algorithm for array rotationGoogle

Circular rotation by K positionsGoogle

Balanced Parenthesis ProblemGoogle

Operations on Strings

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Problems

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Check whether a character is a vowel or consonantGoogle

Check whether a character is alphabet or notGoogle

Find ASCII value of a characterGoogle

Length of the string without strlen()Google

Toggle each character in a stringGoogle

Count the number of vowelsGoogle

Remove the vowels from a StringGoogle

Check if a string is PalindromeGoogle

Print string in reverse orderGoogle

Remove all characters except alphabetsGoogle

Remove spaces from a stringGoogle

Remove brackets from an algebraic expressionGoogle

Count the sum of numbers in a stringGoogle

Capitalize first and last character of each wordGoogle

Calculate frequency of characters in a stringGoogle

Find non-repeating characters in a stringGoogle

Check if two strings are AnagramGoogle

Replace a substring in a stringGoogle

Replace a word with another word in a stringGoogle

Count common subsequence in two stringsGoogle

Wildcard string matchGoogle

Print all permutations of a given string in lexicographic orderGoogle

Advanced Codes related to Arrays

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Problems

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Sort array of 0,1,2 without using sorting algorithmGoogle

Find Kth max and min elementGoogle

Move negative elements to one sideGoogle

Find Union and Intersection of sorted arraysGoogle

Largest sum contiguous SubarrayGoogle

Minimize maximum difference between heightsGoogle

Minimum number of jumps to reach endGoogle

Find duplicate in array of N+1 integersGoogle

Merge 2 sorted arrays without extra spaceGoogle

Kadane’s AlgorithmGoogle

Merge IntervalsGoogle

Count InversionGoogle

Best time to buy and Sell stockGoogle

Find all pairs with sum equal to given numberGoogle

Find if there is any subarray with sum 0Google

Find factorial of a large numberGoogle

Find common elements in 3 sorted arraysGoogle

Rearrange array in alternating positive/negative with O(1) spaceGoogle

Find elements that appear more than n/k timesGoogle

Max profit by buying and selling twiceGoogle

Next PermutationGoogle

Find longest consecutive subsequenceGoogle

Trapping Rain Water problemGoogle

Chocolate Distribution problemGoogle

Smallest Subarray with sum greater than given valueGoogle

Three way partitioning around a valueGoogle

Minimum operations to make array palindromeGoogle

Median of 2 sorted arrays (equal size)Google

Median of 2 sorted arrays (different size)Google

Codes related to Matrix

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Problems

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Spiral traversal on a MatrixGoogle

Search an element in a matrixGoogle

Find median in a row-wise sorted matrixGoogle

Find row with maximum number of 1’sGoogle

Print elements in sorted order from row-col sorted matrixGoogle

Find a specific pair in a matrixGoogle

Rotate matrix by 90 degreesGoogle

Kth smallest element in row-col sorted matrixGoogle

Common elements in all rows of a matrixGoogle

Pattern Printing: Star Patterns

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Problems

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Square Star Pattern (solid)Google

Hollow Square Star PatternGoogle

Rhombus Star PatternGoogle

Rectangle Star Pattern (solid)Google

Hollow Rectangle Star PatternGoogle

Parallelogram Star PatternGoogle

Mirrored Rhombus Star PatternGoogle

Triangle Star Pattern (solid)Google

Pyramid Star PatternGoogle

Hollow Pyramid Star PatternGoogle

Inverted Pyramid Star PatternGoogle

Inverted Hollow Pyramid Star PatternGoogle

Half Diamond Star PatternGoogle

Half Diamond Star Pattern InvertedGoogle

Diamond Star PatternGoogle

Pattern Printing: Number Patterns

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Problems

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Basic Square 1 PatternGoogle

Basic Square incrementing PatternGoogle

Internal varsity square PatternGoogle

Basic Right Triangle Number PatternGoogle

Basic Right Triangle Number Pattern (Inverted)Google

Basic incrementing Triangle Pattern (init 3)Google

Basic incrementing Triangle Pattern (Inverted, init 3)Google

Basic double incrementing Triangle Pattern (init 3)Google

Basic incrementing Diamond Pattern (Inverted, init 3)Google

Basic double incrementing Triangle Pattern (init 3 alternate)Google

Basic incrementing Triangle Pattern (Mirrored, init 3)Google

Basic incrementing inverted mirrored Triangle PatternGoogle

Basic incrementing Triangle Pattern + Inverted MixGoogle

Basic Diamond Number Star PatternGoogle

Basic Diamond Number Star Pattern (Sandwich)Google

Basic Diamond Number Star Pattern (Sandwich Inverted)Google

Basic Diamond Number Star Pattern (initialized)Google

Number-Star Mix Patterns

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Problems

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Basic incrementing Squared Number-Star PatternGoogle

Basic incrementing inverted Squared Number-Star PatternGoogle

Alternate mix of both patterns (Type 2, Type 3)Google

Basic incrementing Triangle & Inverted Mix (variety of forms)Google

Basic Diamond Number Star Pattern variantsGoogle

Miscellaneous Patterns

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Problems

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Pyramid star patternGoogle

Pyramid number patternGoogle

Palindromic Pyramid PatternGoogle

Diamond star patternGoogle

Diamond number patternGoogle

Floyd’s TriangleGoogle

Pascal triangleGoogle

Check array similarityGoogle

Square sum programGoogle

Longest palindrome in arrayGoogle