two elements with difference k in c 2b 2b

1bool diffK(int A[], int N, int K) {
2    sort(A, A+N);
3    int i = 0, j = 0;
4    while (i < N && j < N) {
5        if (A[i] == A[j] + K) return true;
6        else if (A[i] < A[j] + K) i++;
7        else j++;
8    }
9    return false;
10}