Help me in solving DSAAGP16 problem

help
,
1

My issue

can you explain this in detail

My code

#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    
    int arr[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    
    int m;
    scanf("%d", &m);
    
    for (int i = 0; i < m; i++) {
        int a, b;
        scanf("%d %d", &a, &b);
        int sum = 0;
        for (int j = a - 1; j < b; j++) {
            sum += arr[j];
        }
        printf("%d\n", sum);
    }
    
    return 0;
}

Learning course: BCS301: Data structures
Problem Link: https://www.codechef.com/learn/course/abesit-dsa/ABESITDS07/problems/DSAAGP16

2

1. Include the Standard Input/Output Library

#include <stdio.h>

This line includes the standard input/output library, which allows us to use functions like scanf and printf.

2. Main Function

int main() {

This is the main function where the execution of the program begins.

3. Read the Size of the Array

    int n;
    scanf("%d", &n);

Here, we declare an integer n and use scanf to read its value from the user. This value represents the size of the array.

4. Declare and Populate the Array

    int arr[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

We declare an array arr of size n. Then, we use a for loop to read n integers from the user and store them in the array.

5. Read the Number of Queries

    int m;
    scanf("%d", &m);

We declare another integer m and use scanf to read its value. This value represents the number of queries.

6. Process Each Query

    for (int i = 0; i < m; i++) {
        int a, b;
        scanf("%d %d", &a, &b);
        int sum = 0;
        for (int j = a - 1; j < b; j++) {
            sum += arr[j];
        }
        printf("%d\n", sum);
    }

We use a for loop to process each of the m queries. For each query:

  • We read two integers a and b which represent the range of indices in the array.
  • We initialize a variable sum to 0.
  • We use another for loop to iterate from index a-1 to b-1 (since array indices start from 0) and calculate the sum of the elements in this range.
  • We print the sum for each query.

7. End of the Program

    return 0;
}

Finally, we return 0 to indicate that the program has executed successfully.