时间差就是完成时间

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#include<stdio.h>
int merge(int arr[], int left, int mid, int right) {
int j = mid + 1;
int i = left;
int arr1[100];
int l = 0;
while (i <= mid && j <= right) {
if (arr[i] <= arr[j]) {
arr1[l++] = arr[j++];
}
else {
arr1[l++] = arr[i++];
}
}
while (i <= mid) {
arr1[l++] = arr[i++];
}
while (j <= right) {
arr1[l++] = arr[j++];
}
for (i = left, l = 0; i <= right; i++, l++) {
arr[i] = arr1[l];
}
return 0;
}
void sort(int arr[], int left,int right) {
if (left < right) {
int mid = (right + left) / 2;
sort(arr, left, mid);
sort(arr, mid + 1, right);
merge(arr, left, mid, right);
}

}
void printarr(int arr[], int b) {
for (int i = 0; i < b; i++) {
printf("%d,", arr[i]);
}
}

/*残疾c连arraylist都没有666*/
int main(void) {
int a1[10];
for (int i = 0;i < 10;i++) {
scanf_s("%d", &a1[i]);

}
int n = sizeof(a1) / sizeof(a1[0]);/*
int占位大小一定,arr里面元素占位就是整体大小*/
sort(a1, 0, n - 1);
printarr(a1, n);
return 0;
}