Whats wrong with my code its not passing 1 test case

#1
#2

@sarthaksingh hey sarthak your code is not working for the large input this is because of the fact you have done mistake in the while loop.
int index = dp[m][n];
char lcs[index+1];
lcs[index] = ’ ';
int i = m, j = n;
while (i > 0 && j > 0)
{
if (a[i-1] == b[j-1])
{

      lcs[index-1] = a[i-1]; 
      i--; j--; index--;    
  } 

  else if (dp[i-1][j] > dp[i][j-1]) 
     i--; 
  else
     j--;

}

cout << lcs;

#3

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