C语言-数据结构(一)

void sort(int list[], int n) {
     int i, j, temp;
     for (i = 0; i < n - 1; i++) {
         for (j = i; j < n; j++) {
             if (list[i] < list[j]) {
                 temp = list[i];
                 list[i] = list[j];
                 list[j] = temp;
             }
         }
     }
 }

int binsearch(int *list, int search, int num) {
    int middle;
    int left = 0;
    int right = num - 1;

    while (left <= right) {
        middle = (left + right) / 2;
        if (list[middle] > search) {
            right = middle - 1;
        } else if (list[middle] == search) {
            return middle;
        } else {
            left = middle + 1;
        }
    }

    return -1;
}

int binsearch(int *list, int search, int left, int right) {
    int middle;
    if (left <= right) {
        middle = (left + right) / 2;
        if (list[middle] > search) {
            return binsearch(list, search, left, middle - 1);
        } else if (list[middle] == search) {
            return middle;
        } else {
            return binsearch(list, search, middle + 1, right);
        }
    }
    return -1;
}