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Implement Binary Search using recursion.
bool binary_search(vector<int> sorted_nums, int low, int high, int K) {
if (low > high) {
return false;
int mid = (low+high)/2;
if (sorted_nums[mid] == K) {
return true;
bool is_found = false;
if (sorted_nums[mid] < K) {
is_found = binary_search(sorted_nums, mid + 1, high, K);
} else {
is_found = binary_search(sorted_nums, low, mid - 1, K);
return is_found;
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