diff options
author | Santo Cariotti <dcariotti24@gmail.com> | 2020-10-18 18:56:43 +0200 |
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committer | Santo Cariotti <dcariotti24@gmail.com> | 2020-10-20 09:08:52 +0200 |
commit | f279107065146a4940f5e73602a1c3c09e58b31d (patch) | |
tree | fd892749637a8b6c5c31ccb80bba04ade76ab87a /1_anno/Programmazione_2/algorithms/mergesort.cc | |
parent | 4e063e32250312c38d5646840719b62429362b21 (diff) |
chore: name of first year folder
Diffstat (limited to '1_anno/Programmazione_2/algorithms/mergesort.cc')
-rw-r--r-- | 1_anno/Programmazione_2/algorithms/mergesort.cc | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/1_anno/Programmazione_2/algorithms/mergesort.cc b/1_anno/Programmazione_2/algorithms/mergesort.cc new file mode 100644 index 0000000..68d28cb --- /dev/null +++ b/1_anno/Programmazione_2/algorithms/mergesort.cc @@ -0,0 +1,52 @@ +#include<iostream> + +using namespace std; + +void merge(int A[], int l, int q, int r) { + int i = l; + int j = q+1; + int k = l; + int B[r]; + + while((i <= q) && (j <= r)) { + if(A[i] <= A[j]) + B[k] = A[i++]; + else + B[k] = A[j++]; + + k++; + } + + while(i <= q) + B[k++] = A[i++]; + + while(j <= r) + B[k++] = A[j++]; + + for(k = l; k <= r; ++k) + A[k] = B[k]; +} + +void mergesort(int A[], int l, int r) { + if(l < r) { + int q = (l+r)/2; + mergesort(A, l, q); + mergesort(A, q+1, r); + merge(A, l, q, r); + } +} + + +int main() { + int a[] = {7,1,22,3,2,12,27,31,6}; + for(int i = 0; i < 9; ++i) { + cout << a[i] << ' '; + } + cout << endl; + mergesort(a, 0, 8); + for(int i = 0; i < 9; ++i) { + cout << a[i] << ' '; + } + + return 0; +} |