VCS code not working

Please help me check this code. It is working fine but the judge is still rejecting it.

#include <stdio.h>
#include <vector>

bool isin (std::vector <int> array, int const& n)
		int start=0, end=array.size();
		while (start<=end){
			int m = (start+end)/2;
			if (array[m] == n)
			    return m<array.size();
				if (array[m] < n)
					start = m+1;
				else if(array[m] > n)
					end = m-1;
		return false;
int main(){
    short int tests, length, ignored, tracked;
    scanf("%hd", &tests);
    while (tests--){
        scanf("%hd %hd %hd", &length, &ignored, &tracked);
        std::vector <int> ign(ignored,0);
        std::vector <int> igntrc;
        int i=-1, lower=0;
        while (++i<ignored){
            scanf ("%d", &ign[i]);
            while (++lower<ign[i])
        int ok = 0, nok=igntrc.size();
        while (tracked--){
            int n;
            scanf ("%d", &n);
            if (isin(igntrc, n))
            if (isin(ign, n))
        printf("%d %d\n", ok, nok);
    return 0;

Well, the easier approach for this question is to use sets for both the sequences…

Then you may observe that the solution for this problem is

  1. Number of elements in intersection of given sets
  2. N - Number of elements in union of given sets

You can read more about sets in c++ here and about union and intersection of arrays in c++ here

Have a look at my code (java) here because i don’t code in C++.

Please ACCEPT and UPVOTE if you find this helpful… :slight_smile:

Thanks taran_1407. Your approach worked but I cannot accept it because it is not really the answer I was looking for. My code is working fine while testing on local/online compilers but it has gotten rejected by the judge and that’s what I need to understand.

Looks like your code working now!!

Well, you are approaching the problem in a wrong manner…

First Thing, In your code, where are you adding elements to ign vector

Second thing, i feel you are handling input in a wrong manner…

Intended sequence of Operations

First add elements to first vector,

Then add elements to second vector,

ok = 0; nok = 0;

Then run a for loop from 1 to length

if(isin(ign) && isin(igntrc))ok++;

if(!isin(ign) && !isin(igntrc))nok++;

then print ok and nok

Please Accept my answer if you find this helpful…

Feel free to ask anything…

Can someone please tell me what is wrong with this code?