#include <stdio.h>
#define MAX 100
typedef struct Job {
char id[5];
int deadline;
int profit;
} Job;
void jobSequencingWithDeadline(Job jobs[], int n);
int minValue(int x, int y) {
if(x < y) return x;
return y;
}
int main(void) {
//variables
int i, j;
//jobs with deadline and profit
Job jobs[5] = {
{"j1", 2, 60},
{"j2", 1, 100},
{"j3", 3, 20},
{"j4", 2, 40},
{"j5", 1, 20},
};
//temp
Job temp;
//number of jobs
int n = 5;
//sort the jobs profit wise in descending order
for(i = 1; i < n; i++) {
for(j = 0; j < n - i; j++) {
if(jobs[j+1].profit > jobs[j].profit) {
temp = jobs[j+1];
jobs[j+1] = jobs[j];
jobs[j] = temp;
}
}
}
printf("%10s %10s %10s\n", "Job", "Deadline", "Profit");
for(i = 0; i < n; i++) {
printf("%10s %10i %10i\n", jobs[i].id, jobs[i].deadline, jobs[i].profit);
}
jobSequencingWithDeadline(jobs, n);
return 0;
}
void jobSequencingWithDeadline(Job jobs[], int n) {
//variables
int i, j, k, maxprofit;
//free time slots
int timeslot[MAX];
//filled time slots
int filledTimeSlot = 0;
//find max deadline value
int dmax = 0;
for(i = 0; i < n; i++) {
if(jobs[i].deadline > dmax) {
dmax = jobs[i].deadline;
}
}
//free time slots initially set to -1 [-1 denotes EMPTY]
for(i = 1; i <= dmax; i++) {
timeslot[i] = -1;
}
printf("dmax: %d\n", dmax);
for(i = 1; i <= n; i++) {
k = minValue(dmax, jobs[i - 1].deadline);
while(k >= 1) {
if(timeslot[k] == -1) {
timeslot[k] = i-1;
filledTimeSlot++;
break;
}
k--;
}
//if all time slots are filled then stop
if(filledTimeSlot == dmax) {
break;
}
}
//required jobs
printf("\nRequired Jobs: ");
for(i = 1; i <= dmax; i++) {
printf("%s", jobs[timeslot[i]].id);
if(i < dmax) {
printf(" --> ");
}
}
//required profit
maxprofit = 0;
for(i = 1; i <= dmax; i++) {
maxprofit += jobs[timeslot[i]].profit;
}
printf("\nMax Profit: %d\n", maxprofit);
}
