two sum in set cpp code example
Example: two sum problem in c++
bool twosum(int A[], int N, int X) {
sort(A, A+N);
int i = 0, j = N-1;
while (i < j) {
if (A[i] + A[j] == X) return true;
else if (A[i] + A[j] > X) j--;
else i++;
}
return false;
}