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-rw-r--r--1_anno/Programmazione_2/algorithms/insertionsort.cc42
1 files changed, 42 insertions, 0 deletions
diff --git a/1_anno/Programmazione_2/algorithms/insertionsort.cc b/1_anno/Programmazione_2/algorithms/insertionsort.cc
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+++ b/1_anno/Programmazione_2/algorithms/insertionsort.cc
@@ -0,0 +1,42 @@
+#include<iostream>
+
+using namespace std;
+
+void insertionsort(int a[], int n) {
+ for(int i = 1; i < n; ++i) {
+ int j = i-1;
+ int key = a[i];
+ while(j > -1 && a[j] > key) {
+ swap(a[j+1], a[j]);
+ --j;
+ }
+ a[j+1] = key;
+ }
+}
+
+void insertionsort_rec(int a[], int n) {
+ if(n < 2) return;
+ insertionsort_rec(a, n-1);
+
+ int key = a[n-1];
+ int j = n-2;
+
+ while(j > -1 && a[j] > key) {
+ swap(a[j+1], a[j]);
+ --j;
+ }
+
+ a[j+1] = key;
+
+}
+
+int main() {
+ int arr[10] = {3, 450, 12, 4, -1, 0, 24, 95, 123, 0};
+ for(int i = 0; i < 10; ++i)
+ cout << *(arr+i) << ' ';
+ cout << endl;
+ insertionsort_rec(arr, 10);
+ for(int i = 0; i < 10; ++i)
+ cout << *(arr+i) << ' ';
+ return 0;
+}