Quicksort and file rearrange

Lab1/mergesort.c

@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void MergeSort(int A[], int l, int r, int B[]) {
+  int m = (l + r) / 2;
+  if (m - l > 0) {
+    MergeSort(A, l, m, B);
+  }
+
+  if (r - m > 0) {
+    MergeSort(A, m + 1, r, B);
+  }
+
+  int i = l;
+  int j = m + 1;
+  for (int k = l; k <= r; k++) {
+    if ((i <= m && j > r) || ((i <= m && j <= r) && A[i] <= A[j])) {
+      B[k] = A[i];
+      i++;
+    } else {
+      B[k] = A[j];
+      j++;
+    }
+  }
+
+  for (int k = l; k <= r; k++) {
+    A[k] = B[k];
+  }
+}
+
+int main() {
+  int size;
+  int res = scanf("%d", &size);
+  if (res != 1) {
+    fprintf(stderr, "Error reading size\n");
+    return 1;
+  }
+
+  int *arrayA = malloc(sizeof(int) * size);
+  for (int i = 0; i < size; i++) {
+    res = scanf("%d", &arrayA[i]);
+    if (res != 1) {
+      fprintf(stderr, "Error reading array element\n");
+      free(arrayA);
+      return 1;
+    }
+  }
+
+  int *arrayB = malloc(sizeof(int) * size);
+  MergeSort(arrayA, 0, size - 1, arrayB);
+
+  return 0;
+}