#include

#include

#include

#include

#define PASS$\_$THRESHOLD $60$

int $**$grades;

int num$\_$students, num$\_$questions;

int $*$question$\_$pass$\_$counts;

int total$\_$pass$\_$count $=0$;

int max$\_$grade $=0,$ min$\_$grade $=100$;

sem$\_$t sem;

typedef struct $\{$

int id;

float average;

int passed;

$\}$ Student;

Student $*$students;

void read$\_$data$($const char $*$filename$)\{$

FILE $*$file $=$ fopen$($filename$,"$r$")$;

if $(!$file$)\{$

perror$("$Error opening input file"$)$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

fscanf$($file$,"\%$d $\%$d$",$ &num$\_$students, &num$\_$questions$)$;

grades $=$ malloc$($num$\_$students $*$ sizeof$($int $*))$;

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

grades$[$i$]=$ malloc$($num$\_$questions $*$ sizeof$($int$))$;

$\}$

students $=$ malloc$($num$\_$students $*$ sizeof$($Student$))$;

question$\_$pass$\_$counts $=$ calloc$($num$\_$questions, sizeof$($int$))$;

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

fscanf$($file$,"\%$d$",$ &students$[$i$].$id$)$;

for $($int j $=0$; j $<$ num$\_$questions; j$++)\{$

fscanf$($file$,"\%$d$",$ &grades$[$i$][$j$])$;

$\}$

$\}$

fclose$($file$)$;

$\}$

void $*$process$\_$student$($void $*$arg$)\{$

int student$\_$index $=*($int $*)$arg;

free$($arg$)$;

float sum $=0$;

int local$\_$max $=0,$ local$\_$min $=100$;

for $($int j $=0$; j $<$ num$\_$questions; j$++)\{$

int grade $=$ grades$[$student$\_$index$][$j$]$;

sum $+=$ grade;

if $($grade $>=$ PASS$\_$THRESHOLD$)\{$

sem$\_$wait$($&sem$)$;

question$\_$pass$\_$counts$[$j$]++$;

sem$\_$post$($&sem$)$;

$\}$

if $($grade $>$ local$\_$max$)$ local$\_$max $=$ grade;

if $($grade $<$ local$\_$min$)$ local$\_$min $=$ grade;

$\}$

students$[$student$\_$index$].$average $=$ sum $/$ num$\_$questions;

students$[$student$\_$index$].$passed $=($students$[$student$\_$index$].$average $>=$ PASS$\_$THRESHOLD$)$;

sem$\_$wait$($&sem$)$;

if $($students$[$student$\_$index$].$passed$)$ total$\_$pass$\_$count$++$;

if $($local$\_$max $>$ max$\_$grade$)$ max$\_$grade $=$ local$\_$max;

if $($local$\_$min $<$ min$\_$grade$)$ min$\_$grade $=$ local$\_$min;

sem$\_$post$($&sem$)$;

return NULL;

$\}$

void write$\_$results$($const char $*$filename$)\{$

FILE $*$file $=$ fopen$($filename$,"$w$")$;

if $(!$file$)\{$

perror$("$Error opening output file"$)$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

fprintf$($file$,"\%$d $\%\mathrm{.}2$f $\%$s

$",$ students$[$i$].$id$,$ students$[$i$].$average,

students$[$i$].$passed $?$ "Passed" : "Failed"$)$;

$\}$

fprintf$($file$,"$

$---$ Overall Statistics $---$

$")$;

fprintf$($file$,$ "Number of students passing each question:

$")$;

for $($int i $=0$; i $<$ num$\_$questions; i$++)\{$

fprintf$($file$,$ "Question $\%$d: $\%$d students passed.

$",$ i $+1,$ question$\_$pass$\_$counts$[$i$])$;

$\}$

fprintf$($file$,$ "Total number of students who passed overall: $\%$d

$",$ total$\_$pass$\_$count$)$;

fprintf$($file$,$ "Highest grade: $\%$d

$",$ max$\_$grade$)$;

fprintf$($file$,$ "Lowest grade: $\%$d

$",$ min$\_$grade$)$;

fclose$($file$)$;

$\}$

int main$()\{$

read$\_$data$("$input$.$txt$")$;

sem$\_$init$($&sem, $0,1)$;

pthread$\_$t $*$threads $=$ malloc$($num$\_$students $*$ sizeof$($pthread$\_$t$))$;

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

int $*$arg $=$ malloc$($sizeof$($int$))$;

$*$arg $=$ i;

pthread$\_$create$($&threads$[$i$],$ NULL, process$\_$student, arg$)$;

$\}$

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

pthread$\_$join$($threads$[$i$],$ NULL$)$;

$\}$

write$\_$results$("$results$.$txt$")$;

for $($int i $=0$; i $<$ num$\_$students; i$++)\{$

free$($grades$[$i$])$;

$\}$

free$($grades$)$;

free$($question$\_$pass$\_$counts$)$;

free$($students$)$;

free$($threads$)$;

sem$\_$destroy$($&sem$)$;

return $0$;

$\}$

can you solve the above code with a different solution method using multithreading and semophore again

I added sample input and output below

input:

$3$

$4$

$10178859045$

$10245605530$

$10388929590$

output:

$10174\mathrm{.}50$ Passed

$10247\mathrm{.}50$ Failed

$10391\mathrm{.}25$ Passed

$---$ Overall Statistics $---$

Number of students passing each question:

Question $1$: $2$ students passed.

Question $2$: $3$ students passed.

Question $3$: $2$ students passed.

Question $4$: $1$ students passed.

Total number of students who passed overall: $2$

Highest grade: $95$

Lowest grade: $30$