Samsung R&D Interview Questions 2026 - C, OS & Data Structures Focus

Samsung R&D Overview

Attribute	Details
Founded	1969 (R&D India: 1996)
Headquarters	Suwon, South Korea (India: Bangalore, Noida)
Employees in India	25,000+
R&D Focus	Mobile, Semiconductor, Display, Network
Key Products	Galaxy Smartphones, Exynos Processors, Memory
India Labs	SRI-B (Bangalore), SRI-N (Noida)

Samsung R&D Institute India is Samsung's largest R&D center outside Korea, working on flagship mobile products, Tizen OS, and next-generation technologies.

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Samsung R&D Interview Process 2026

Hiring Divisions

Division	Focus	Skills Required
Mobile R&D	Android, System Optimization	C/C++, Java, OS
Advanced Technology	AI/ML, Computer Vision	Python, C++, Algorithms
Semiconductor	Exynos, Memory	Verilog, C, Architecture
Network	5G, Communication	C, Protocols, Signal Processing

Selection Stages

Stage	Duration	Format
GSAT (General Samsung Aptitude Test)	90 mins	Quant + Reasoning + Technical
Technical Round 1	60 mins	Coding + CS Fundamentals
Technical Round 2	60 mins	Advanced DS/Algo + System Design
Technical Round 3	45 mins	Domain Expertise
HR Interview	30 mins	Behavioral, Compensation

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GSAT (General Samsung Aptitude Test) Pattern

Section-wise Breakdown

Section	Questions	Time	Topics
Quantitative Aptitude	25	35 mins	Arithmetic, Algebra, Geometry
Logical Reasoning	20	25 mins	Puzzles, Data Sufficiency
Verbal Ability	15	20 mins	RC, Grammar, Vocabulary
Technical (C/DS)	20	30 mins	Pointers, Arrays, Output tracing
Total	80	110 mins	-

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C Programming Questions

Question 1: Pointer Output Tracing

#include <stdio.h>

int main() {
    int arr[] = {10, 20, 30, 40, 50};
    int *ptr = arr;
    
    // Question 1
    printf("%d ", *ptr++);        // Output: 10 (post-increment)
    printf("%d ", *ptr);          // Output: 20
    
    // Question 2
    int *ptr2 = arr;
    printf("%d ", ++*ptr2);       // Output: 11 (pre-increment value)
    printf("%d ", *ptr2);         // Output: 11
    
    // Question 3 - Pointer arithmetic
    int *p1 = arr;
    int *p2 = &arr[3];
    printf("%ld ", p2 - p1);      // Output: 3 (elements between)
    
    // Question 4 - 2D array
    int matrix[3][4] = {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}};
    printf("%d ", *(*(matrix+1)+2));  // Output: 7 (matrix[1][2])
    printf("%d ", *(matrix[1]+2));     // Output: 7
    
    return 0;
}

Question 2: Memory Layout and Storage Classes

#include <stdio.h>

// Data segment - initialized global
int global_var = 100;

// BSS segment - uninitialized global
static int static_global;

// Code segment (Text)
void function() {
    // Stack
    int local_var = 50;
    
    // Static - Data segment
    static int static_local = 200;
    
    // Heap
    int *heap_var = (int *)malloc(sizeof(int));
    
    printf("Global: %p\n", &global_var);
    printf("Static Global: %p\n", &static_global);
    printf("Local: %p\n", &local_var);
    printf("Static Local: %p\n", &static_local);
    printf("Heap: %p\n", heap_var);
}

// Common output tracing questions:
void test_storage() {
    static int count = 0;  // Retains value between calls
    count++;
    printf("%d ", count);
}

// Calling test_storage() 3 times outputs: 1 2 3

Question 3: Preprocessor and Macros

#include <stdio.h>

#define SQUARE(x) ((x) * (x))
#define CUBE(x) (SQUARE(x) * (x))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define SWAP(a, b) { typeof(a) temp = a; a = b; b = temp; }

int main() {
    // Common trick questions
    int a = 5, b = 3;
    
    printf("%d\n", SQUARE(a++));     // 25 (a becomes 7!)
    // Expansion: ((a++) * (a++)) = 5 * 6 = 30 (undefined behavior)
    
    printf("%d\n", MAX(a++, b++));    // Side effects issue
    // Expansion: ((a++) > (b++) ? (a++) : (b++))
    
    // Stringification
    #define STR(x) #x
    printf("%s\n", STR(Hello World));  // "Hello World"
    
    // Token pasting
    #define CONCAT(a, b) a##b
    int xy = 10;
    printf("%d\n", CONCAT(x, y));     // xy = 10
    
    return 0;
}

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Operating Systems Questions

Question 4: Process vs Thread

#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>

/* Process Creation */
void process_demo() {
    pid_t pid = fork();
    
    if (pid < 0) {
        perror("Fork failed");
    } else if (pid == 0) {
        // Child process
        printf("Child: PID=%d, Parent PID=%d\n", getpid(), getppid());
        execlp("ls", "ls", "-l", NULL);  // Replace process image
    } else {
        // Parent process
        wait(NULL);  // Wait for child
        printf("Parent: Child PID=%d\n", pid);
    }
}

/* Thread Creation (pthread) */
#include <pthread.h>

void* thread_function(void *arg) {
    int *num = (int *)arg;
    printf("Thread: ID=%lu, Arg=%d\n", pthread_self(), *num);
    return NULL;
}

void thread_demo() {
    pthread_t tid;
    int value = 42;
    
    pthread_create(&tid, NULL, thread_function, &value);
    pthread_join(tid, NULL);
}

Aspect	Process	Thread
Memory	Separate address space	Shares address space
Creation	Heavy (fork/exec)	Light (pthread_create)
Communication	IPC (pipes, sockets, shared memory)	Direct shared memory
Overhead	High	Low
Crash Impact	Only that process	Entire process
Context Switch	Expensive (MMU update)	Cheaper

Question 5: Virtual Memory and Paging

/* Virtual Memory Concepts */

/* Page Table Structure (simplified) */
#define PAGE_SIZE 4096
#define NUM_PAGES 1024

typedef struct {
    uint32_t present : 1;      // Page in memory
    uint32_t rw : 1;           // Read/Write permission
    uint32_t user : 1;         // User/Supervisor
    uint32_t accessed : 1;     // Accessed bit
    uint32_t dirty : 1;        // Modified bit
    uint32_t frame : 20;       // Physical frame number
} PageTableEntry;

/* Address Translation */
#define VPN_MASK 0xFFC00000
#define OFFSET_MASK 0x003FFFFF

void translate_address(uint32_t virtual_addr) {
    uint32_t vpn = (virtual_addr & VPN_MASK) >> 22;
    uint32_t offset = virtual_addr & OFFSET_MASK;
    
    PageTableEntry *pte = &page_table[vpn];
    
    if (!pte->present) {
        // Page fault - load from disk
        handle_page_fault(vpn);
    }
    
    uint32_t physical_addr = (pte->frame << 22) | offset;
    printf("VA: 0x%x -> PA: 0x%x\n", virtual_addr, physical_addr);
}

/* Page Replacement: LRU Implementation */
typedef struct {
    uint32_t page_num;
    uint32_t last_access;
} LRUPage;

uint32_t find_lru_page(LRUPage *pages, int num_pages) {
    uint32_t lru_idx = 0;
    uint32_t oldest = pages[0].last_access;
    
    for (int i = 1; i < num_pages; i++) {
        if (pages[i].last_access < oldest) {
            oldest = pages[i].last_access;
            lru_idx = i;
        }
    }
    
    return lru_idx;
}

Question 6: Deadlock and Synchronization

#include <pthread.h>
#include <semaphore.h>

/* Mutex for mutual exclusion */
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

void critical_section() {
    pthread_mutex_lock(&mutex);
    // Critical section
    pthread_mutex_unlock(&mutex);
}

/* Semaphore for resource counting */
sem_t semaphore;

void init_resource(int count) {
    sem_init(&semaphore, 0, count);
}

void use_resource() {
    sem_wait(&semaphore);     // P() - acquire
    // Use resource
    sem_post(&semaphore);     // V() - release
}

/* Deadlock Example */
pthread_mutex_t lock1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t lock2 = PTHREAD_MUTEX_INITIALIZER;

void* thread_a(void *arg) {
    pthread_mutex_lock(&lock1);
    sleep(1);  // Force race condition
    pthread_mutex_lock(&lock2);  // May deadlock
    // Critical section
    pthread_mutex_unlock(&lock2);
    pthread_mutex_unlock(&lock1);
    return NULL;
}

void* thread_b(void *arg) {
    pthread_mutex_lock(&lock2);
    sleep(1);
    pthread_mutex_lock(&lock1);  // May deadlock
    // Critical section
    pthread_mutex_unlock(&lock1);
    pthread_mutex_unlock(&lock2);
    return NULL;
}

/* Solution: Lock ordering */
void safe_thread() {
    // Always acquire lock1 before lock2
    pthread_mutex_lock(&lock1);
    pthread_mutex_lock(&lock2);
    // Critical section
    pthread_mutex_unlock(&lock2);
    pthread_mutex_unlock(&lock1);
}

Deadlock Conditions (Coffman Conditions):

1. Mutual Exclusion: Resources cannot be shared
2. Hold and Wait: Process holds resources while waiting
3. No Preemption: Resources cannot be forcibly taken
4. Circular Wait: Circular chain of waiting processes

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Data Structures Questions

Question 7: Stack Implementation

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define STACK_SIZE 100

typedef struct {
    int items[STACK_SIZE];
    int top;
} Stack;

void init_stack(Stack *s) {
    s->top = -1;
}

bool is_empty(Stack *s) {
    return s->top == -1;
}

bool is_full(Stack *s) {
    return s->top == STACK_SIZE - 1;
}

void push(Stack *s, int value) {
    if (is_full(s)) {
        printf("Stack Overflow\n");
        return;
    }
    s->items[++s->top] = value;
}

int pop(Stack *s) {
    if (is_empty(s)) {
        printf("Stack Underflow\n");
        return -1;
    }
    return s->items[s->top--];
}

int peek(Stack *s) {
    if (is_empty(s)) {
        return -1;
    }
    return s->items[s->top];
}

/* Stack using Linked List */
typedef struct Node {
    int data;
    struct Node *next;
} Node;

typedef struct {
    Node *top;
} StackLL;

void push_ll(StackLL *s, int value) {
    Node *new_node = (Node *)malloc(sizeof(Node));
    new_node->data = value;
    new_node->next = s->top;
    s->top = new_node;
}

int pop_ll(StackLL *s) {
    if (s->top == NULL) {
        return -1;
    }
    Node *temp = s->top;
    int value = temp->data;
    s->top = temp->next;
    free(temp);
    return value;
}

Question 8: Binary Search Tree Operations

#include <stdio.h>
#include <stdlib.h>

typedef struct TreeNode {
    int data;
    struct TreeNode *left;
    struct TreeNode *right;
} TreeNode;

TreeNode* create_node(int value) {
    TreeNode *new_node = (TreeNode *)malloc(sizeof(TreeNode));
    new_node->data = value;
    new_node->left = NULL;
    new_node->right = NULL;
    return new_node;
}

TreeNode* insert(TreeNode *root, int value) {
    if (root == NULL) {
        return create_node(value);
    }
    
    if (value < root->data) {
        root->left = insert(root->left, value);
    } else if (value > root->data) {
        root->right = insert(root->right, value);
    }
    
    return root;
}

TreeNode* find_min(TreeNode *root) {
    while (root->left != NULL) {
        root = root->left;
    }
    return root;
}

TreeNode* delete_node(TreeNode *root, int value) {
    if (root == NULL) return root;
    
    if (value < root->data) {
        root->left = delete_node(root->left, value);
    } else if (value > root->data) {
        root->right = delete_node(root->right, value);
    } else {
        // Node found
        if (root->left == NULL) {
            TreeNode *temp = root->right;
            free(root);
            return temp;
        } else if (root->right == NULL) {
            TreeNode *temp = root->left;
            free(root);
            return temp;
        }
        
        // Node with two children
        TreeNode *temp = find_min(root->right);
        root->data = temp->data;
        root->right = delete_node(root->right, temp->data);
    }
    
    return root;
}

/* Traversals */
void inorder(TreeNode *root) {
    if (root != NULL) {
        inorder(root->left);
        printf("%d ", root->data);
        inorder(root->right);
    }
}

void preorder(TreeNode *root) {
    if (root != NULL) {
        printf("%d ", root->data);
        preorder(root->left);
        preorder(root->right);
    }
}

void postorder(TreeNode *root) {
    if (root != NULL) {
        postorder(root->left);
        postorder(root->right);
        printf("%d ", root->data);
    }
}

/* Check if BST */
bool is_bst_util(TreeNode *root, int min, int max) {
    if (root == NULL) return true;
    
    if (root->data < min || root->data > max) {
        return false;
    }
    
    return is_bst_util(root->left, min, root->data - 1) &&
           is_bst_util(root->right, root->data + 1, max);
}

bool is_bst(TreeNode *root) {
    return is_bst_util(root, INT_MIN, INT_MAX);
}

Question 9: Graph Algorithms

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <limits.h>

#define MAX_VERTICES 100
#define INF INT_MAX

/* Adjacency Matrix */
int adj_matrix[MAX_VERTICES][MAX_VERTICES];

/* BFS */
void bfs(int start, int n) {
    bool visited[MAX_VERTICES] = {false};
    int queue[MAX_VERTICES];
    int front = 0, rear = 0;
    
    visited[start] = true;
    queue[rear++] = start;
    
    while (front < rear) {
        int curr = queue[front++];
        printf("%d ", curr);
        
        for (int i = 0; i < n; i++) {
            if (adj_matrix[curr][i] && !visited[i]) {
                visited[i] = true;
                queue[rear++] = i;
            }
        }
    }
}

/* DFS */
void dfs_util(int v, int n, bool visited[]) {
    visited[v] = true;
    printf("%d ", v);
    
    for (int i = 0; i < n; i++) {
        if (adj_matrix[v][i] && !visited[i]) {
            dfs_util(i, n, visited);
        }
    }
}

void dfs(int start, int n) {
    bool visited[MAX_VERTICES] = {false};
    dfs_util(start, n, visited);
}

/* Dijkstra's Shortest Path */
void dijkstra(int src, int n) {
    int dist[MAX_VERTICES];
    bool visited[MAX_VERTICES] = {false};
    
    for (int i = 0; i < n; i++) {
        dist[i] = INF;
    }
    dist[src] = 0;
    
    for (int count = 0; count < n - 1; count++) {
        // Find minimum distance vertex
        int min = INF, u;
        for (int v = 0; v < n; v++) {
            if (!visited[v] && dist[v] <= min) {
                min = dist[v];
                u = v;
            }
        }
        
        visited[u] = true;
        
        // Update distances
        for (int v = 0; v < n; v++) {
            if (!visited[v] && adj_matrix[u][v] && 
                dist[u] != INF && 
                dist[u] + adj_matrix[u][v] < dist[v]) {
                dist[v] = dist[u] + adj_matrix[u][v];
            }
        }
    }
    
    // Print distances
    printf("Vertex\tDistance from Source\n");
    for (int i = 0; i < n; i++) {
        printf("%d\t%d\n", i, dist[i]);
    }
}

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Algorithm Questions

Question 10: Sorting Algorithms

/* Quick Sort */
void quick_sort(int arr[], int low, int high) {
    if (low < high) {
        int pi = partition(arr, low, high);
        quick_sort(arr, low, pi - 1);
        quick_sort(arr, pi + 1, high);
    }
}

int partition(int arr[], int low, int high) {
    int pivot = arr[high];
    int i = low - 1;
    
    for (int j = low; j < high; j++) {
        if (arr[j] < pivot) {
            i++;
            swap(&arr[i], &arr[j]);
        }
    }
    swap(&arr[i + 1], &arr[high]);
    return i + 1;
}

/* Merge Sort */
void merge_sort(int arr[], int left, int right) {
    if (left < right) {
        int mid = left + (right - left) / 2;
        merge_sort(arr, left, mid);
        merge_sort(arr, mid + 1, right);
        merge(arr, left, mid, right);
    }
}

void merge(int arr[], int left, int mid, int right) {
    int n1 = mid - left + 1;
    int n2 = right - mid;
    
    int L[n1], R[n2];
    
    for (int i = 0; i < n1; i++) L[i] = arr[left + i];
    for (int j = 0; j < n2; j++) R[j] = arr[mid + 1 + j];
    
    int i = 0, j = 0, k = left;
    
    while (i < n1 && j < n2) {
        if (L[i] <= R[j]) arr[k++] = L[i++];
        else arr[k++] = R[j++];
    }
    
    while (i < n1) arr[k++] = L[i++];
    while (j < n2) arr[k++] = R[j++];
}

Algorithm	Time (Best)	Time (Avg)	Time (Worst)	Space	Stable
Bubble Sort	O(n)	O(n²)	O(n²)	O(1)	Yes
Selection Sort	O(n²)	O(n²)	O(n²)	O(1)	No
Insertion Sort	O(n)	O(n²)	O(n²)	O(1)	Yes
Merge Sort	O(n log n)	O(n log n)	O(n log n)	O(n)	Yes
Quick Sort	O(n log n)	O(n log n)	O(n²)	O(log n)	No
Heap Sort	O(n log n)	O(n log n)	O(n log n)	O(1)	No

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HR Interview Questions

Q1: Why Samsung R&D?

Sample Answer: "Samsung R&D represents the perfect intersection of hardware and software innovation. Having used Samsung devices for years, I've always admired the seamless integration between their hardware and Android ecosystem. SRI-Bangalore's reputation for working on flagship products like the Galaxy S series and pioneering research in foldable technology makes it my top choice. I'm excited about contributing to products used by millions globally."

Q2: Tell me about a time you optimized code

STAR Example:

• Situation: Image processing app taking 5 seconds per frame
• Task: Reduce to real-time (<100ms)
• Action: Profiled code, moved heavy operations to C++, used NEON SIMD, implemented GPU shaders
• Result: 60fps achieved, 50x speedup, presented at internal tech talk

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5 Frequently Asked Questions (FAQs)

Q1: What is the salary for freshers at Samsung R&D in 2026?

A: Samsung R&D offers ₹12-18 LPA for freshers, significantly higher than mass recruiters.

Q2: Is GSAT mandatory for Samsung placement?

A: Yes, GSAT (General Samsung Aptitude Test) is mandatory and serves as the primary screening.

Q3: What programming languages are tested?

A: C is heavily tested in GSAT. C++ and Java may be tested in interviews.

Q4: Does Samsung hire non-CS branches?

A: Yes, ECE, EEE, and IT graduates are also eligible for R&D roles.

Q5: What is the bond period at Samsung?

A: Typically 1-2 years with varying bond amounts based on training investment.

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Last Updated: March 2026 Source: Samsung Careers, GSAT Pattern, Interview Experiences