Check If It Is a Straight Line Problem

Can anyone please help me, to figure out this issue ?

For this input = [[1,1],[2,2],[3,4],[4,5],[5,6],[7,7]]

My soln is showing right result on my system (on codeblocks), but when i tried running it here on leetcode its showing wrong ?
I tried, but unable to figure what exactly is happening ?
Same soln, but then why its showing right answer on my system but here wrong ?

class Solution 
{
    public:
        bool checkStraightLine(vector<vector<int>>& coordinates) 
        {
            bool status = true;
            int n, ctr = 0, lhs, rhs;

            n = coordinates[0].size();
            if(2 < n)
            {
                for(ctr = 0; ctr < n - 1; ctr++)
                {
                    lhs = (coordinates[0][n - 1] - coordinates[0][0]) 
                            * (coordinates[1][ctr] - coordinates[1][0]);
                    rhs = (coordinates[1][n - 1] - coordinates[1][0])
                            * (coordinates[0][ctr] - coordinates[0][0]);
                    if( lhs != rhs )
                    {
                        status = false;		break;
                    }
                }                
            }
            
            return status;    
        }
};

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