From: Jerome Benoit <jerome.benoit@sap.com>
Date: Sat, 4 Mar 2017 17:18:19 +0000 (+0100)
Subject: TP3: Implement the generic merge sort algorithm.
X-Git-Url: https://git.piment-noir.org/?a=commitdiff_plain;h=8c44116a9b634bea71f1526a72540baade817f7f;p=Algorithmic_C.git

TP3: Implement the generic merge sort algorithm.

Signed-off-by: Jerome Benoit <jerome.benoit@sap.com>
---

diff --git a/TP3/tp3.c b/TP3/tp3.c
index 75c3195..7fa3dd7 100644
--- a/TP3/tp3.c
+++ b/TP3/tp3.c
@@ -7,22 +7,24 @@ void AfficheTab(int T[], int n) {
     }
 }
 
-/** This merge sort implementation only work with 2^n array size */
 void TriFusion(int T[], int n) {
     int i = 0, j = 0, k = 0;
+    int milieu = n/2;
     int* T1;
     int* T2;
     
     if (n > 1) {
-        T1 = malloc(n/2*sizeof(int));
-        T2 = malloc(n/2*sizeof(int));
-        for (int i = 0; i < n/2; i++) {
+        T1 = malloc(milieu*sizeof(int));
+        T2 = malloc(((n - milieu)*sizeof(int)));
+        for (int i = 0; i < milieu; i++) {
             T1[i] = T[i];
-            T2[i] = T[i + n/2];
         }
-        TriFusion(T1, n/2);
-        TriFusion(T2, n/2);
-        while (k < n/2 && j < n/2) {
+	for (int i = milieu; i < n; i++) {
+            T2[i - milieu] = T[i];
+	}
+        TriFusion(T1, milieu);
+        TriFusion(T2, n - milieu);
+        while (k < milieu && j < (n - milieu)) {
             if (T1[k] <= T2[j]) {
                 T[i] = T1[k];
                 i++;
@@ -33,12 +35,12 @@ void TriFusion(int T[], int n) {
                 j++;
             }
         }
-        while (k < n/2) {
+        while (k < milieu) {
             T[i] = T1[k];
             i++;
             k++;
         }
-        while (j < n/2) {
+        while (j < n - milieu) {
             T[i] = T2[j];
             i++;
             j++;
@@ -49,7 +51,8 @@ void TriFusion(int T[], int n) {
 }
 
 int main() {
-    int T[] = {2, 7, 2, 3, 4, 1, 5, 5};
+    //int T[] = {2, 7, 2, 3, 4, 1, 5, 5};
+    int T[] = {6, 2, 3, 1, 9, 10, 15, 13, 12, 17};
     int tabSize = sizeof(T)/sizeof(T[0]);
     
     AfficheTab(T, tabSize);