td5 exo4

td5/td5.c

@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 void printt(int t[], int n) {
@@ -11,7 +12,6 @@ void printt(int t[], int n) {
 }
 
 // Exercice 1
-
 void insertion_sort(int t[], int n) {
     for (int i = 0; i < n; i++) {
         int x = t[i];
@@ -23,7 +23,6 @@ void insertion_sort(int t[], int n) {
         t[j + 1] = x;
     }
 }
-
 void selection_sort(int t[], int n) {
     for (int i = 0; i < n; i++) {
         int min = t[i];
@@ -39,6 +38,7 @@ void selection_sort(int t[], int n) {
     }
 }
 
+// Exercice 2
 void cocktail_sort(int t[], int n) {
     for (int i = 0; i < n / 2; i++) {
         for (int j = i; j < n - i - 1; j++) {
@@ -58,6 +58,25 @@ void cocktail_sort(int t[], int n) {
     }
 }
 
+// Exercice 4
+void counting_sort(int t[], int n, int k) {
+    int *counts = malloc(k * sizeof(int));
+    for (int i = 0; i < k; i++) {
+        counts[i] = 0;
+    }
+    for (int i = 0; i < n; i++) {
+        counts[t[i]] += 1;
+    }
+    int len = 0;
+    for (int i = 0; i < k && len < n; i++) {
+        for (int j = 0; j < counts[i]; j++) {
+            t[len] = i;
+            len++;
+        }
+    }
+    free(counts);
+}
+
 const int t[] = {5, 3, 9, 0, 5, 0};
 const int sorted[] = {0, 0, 3, 5, 5, 9};
 const int n = 6;
@@ -74,6 +93,9 @@ int main() {
 
     memcpy(t1, t, n * sizeof(int));
     cocktail_sort(t1, n);
-    printt(t1, n);
+    assert(memcmp(t1, sorted, n * sizeof(int)) == 0);
+
+    memcpy(t1, t, n * sizeof(int));
+    counting_sort(t1, n, 10);
     assert(memcmp(t1, sorted, n * sizeof(int)) == 0);
 }