lazer codechef

Sure! Here is a response providing explanations for each step of the C code for the "lazer" problem on CodeChef:

#include<stdio.h>

int main() {
    int T;
    scanf("%d", &T); // Reading the number of test cases

    while(T--) {
        int N, Q;
        scanf("%d %d", &N, &Q); // Reading the number of lasers and queries

        int lasers[N];
        for(int i = 0; i < N; i++) {
            scanf("%d", &lasers[i]); // Reading the positions of the lasers
        }

        while(Q--) {
            int x, y;
            scanf("%d %d", &x, &y); // Reading the coordinates of a query

            int count = 0;
            for(int i = 0; i < N; i++) {
                if(lasers[i] >= x && lasers[i] <= y) {
                    count++; // Counting the number of lasers between x and y
                }
            }

            printf("%d\n", count); // Printing the number of lasers between x and y
        }
    }

    return 0;
}

Explanation:

1. The code starts by including the necessary header file stdio.h for input/output operations.

2. The main() function is defined, which is the entry point of the program.

3. The variable T is declared to store the number of test cases.

4. The scanf() function is used to read the value of T from the user.

5. The while loop is used to repeat the following steps for each test case.

6. Inside the loop, the variables N and Q are declared to store the number of lasers and queries, respectively.

7. The scanf() function is used to read the values of N and Q from the user.

8. An array lasers of size N is declared to store the positions of the lasers.

9. A for loop is used to iterate N times and read the positions of the lasers using the scanf() function.

10. Another while loop is used to repeat the following steps for each query.

11. Inside the query loop, the variables x and y are declared to store the coordinates of a query.

12. The scanf() function is used to read the values of x and y from the user.

13. A variable count is declared and initialized to 0, which will be used to count the number of lasers between x and y.

14. A for loop is used to iterate N times and check if each laser's position is between x and y.

15. If a laser's position is between x and y, the count variable is incremented.

16. After the for loop, the number of lasers between x and y is printed using the printf() function.

17. The code continues to the next test case if there are any remaining, or exits the program if all test cases have been processed.

18. Finally, the return 0 statement is used to indicate successful execution of the program.

I hope this explanation helps! Let me know if you have any further questions.