Write a c program of 'Array Sum' using pthread and semaphore such that each process needs to spend 5 seconds in critical section i.e. you will set an alarm for it and then exits the critical section using signal.

PLEASE USE C PROGRAMMING TO CODE THIS PROBLEM. EXPLAIN the logic with us of a diagram if possible, or clear enough that i can write this code if I was to ever come across a problem like it again Description Given a board with N rows and M columns, the rows are numbered from 1 to N from top to bottom, and the columns are numbered from 1 to M from left to right. Each element has one diagonal wall which either runs from top-left corner to bottom-right corner, or runs from top-right corner to bottom-left corner. Now given Q queries, you have to output which column the ball will fall out at the bottom row if you put it on top of the board at specific column. (The ball will naturally fall down due to gravity.)   The following figure is a sample. If you drop the ball at column 2, the ball will fall out at the left side. If you drop the ball at column 5, the ball will be stuck in the board. If you drop the ball at column 3, the ball will eventually fall out at column 2.   Input First line…

3. Write a C program multiplication Table.c that outputs the multiplication table as follows: X Multiplication Table 1 2 7 8 9 10 2 7 8 9 10 4 14 16 18 20 6 9 12 15 18 21 24 27 30 8 12 16 20 24 28 32 36 40 35 40 45 50 18 24 30 36 42 48 54 60 42 49 35 42 49 56 63 70 64 72 80 72 81 90 70 80 90 100 3 4 5 6 3 4 5 6 1 1 2 3 3 4 4 5 5 10 15 20 25 30 6 6 12 7 7 14 21 28 35 16 24 32 40 48 8 8 99 18 10 10 20 30 40 50 60 56 27 36 45 54 63

1- Write a C program for Arduino that controls a set of two traffic lights A & B at a crossroads. Assume that: • When the traffic lights (A) are green or amber, the traffic lights (B) are red. • When the traffic lights (B) are green or amber, the traffic lights (A) are red. Green lights must stay on for 15 seconds, amber lights for 5 seconds and red lights for 20 seconds. 2- Sketch the circuit diagram to wire the Arduino to the two traffic lights.

I need a C program where the input is postorder. For example, if the input is postorder: x1 5.12 + x2 7.68 - * x3 / then the resulting output would be an inorder: (((x1+5.12)*(x2-7.68))/x3)