From d3878228d84dd2296cd85d914f27087d3cae2835 Mon Sep 17 00:00:00 2001
From: Alexandre Jesus <adbjesus@gmail.com>
Date: Fri, 16 Sep 2016 09:25:34 +0100
Subject: Add pseudo-random shuffler

---
 include/common.h |  1 +
 src/common.c     | 11 +++++++++++
 src/main/dfs.c   |  7 ++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/include/common.h b/include/common.h
index c61ac4d..9332e6e 100644
--- a/include/common.h
+++ b/include/common.h
@@ -15,5 +15,6 @@ struct front_item * new_front_item(double,  double, struct front_item *, struct
 double dist_items(struct item *, struct item *);
 int len_front(struct front_item *);
 int cmp_items_ratio(const void * a, const void * b);
+int cmp_items_random(const void * a, const void * b);
 
 #endif
diff --git a/src/common.c b/src/common.c
index 7d9e01d..ee98bba 100644
--- a/src/common.c
+++ b/src/common.c
@@ -5,6 +5,8 @@
 #include "structs.h"
 #include "common.h"
 
+#define RAND_MAX 1
+
 struct data * input(char fp[]){
   int i,j;
   FILE *f;
@@ -36,6 +38,15 @@ int cmp_items_ratio(const void * a, const void * b){
   return -1;
 }
 
+int cmp_items_random(const void *a, const void *b) {
+  struct item c = *(struct item *)a;
+  struct item d = *(struct item *)b;
+  if(rand() > 0.5){
+    return 1;
+  }
+  return -1;
+}
+
 void print_data(struct data * d){
   int i;
   printf("### PRINTING DATA - BEGINNING ###\n");
diff --git a/src/main/dfs.c b/src/main/dfs.c
index ca796c5..f28f8ab 100644
--- a/src/main/dfs.c
+++ b/src/main/dfs.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <time.h>
+#include <stdlib.h>
 #include "common.h"
 #include "structs.h"
 #include "dfs.h"
@@ -16,12 +17,16 @@ int main(int argc, char * argv[]){
 
   d = input(argv[1]);
 
+  /* srand() and qsort data  */
+  srand(time(NULL));
+  qsort(d->items, d->N, sizeof(struct item), cmp_items_random);
+
   clock_t t = clock();
   b = dfs(d);
 
   t = clock() - t;
   printf("%f,%d\n",((float)t)/CLOCKS_PER_SEC,len_front(b));
-  
+
   print_front(b);
 
   free_front(b);
-- 
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