I am getting WA in Test case 2, particularly : wrong answer 35th numbers differ — expected: '1', found: '0'. I am unable to find the error in my code for this problem: 1622C - Set or Decrease My submission:193454039. The logic I used:

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My logic was to store all the K pairs in a map<int , vector> such that the first element of each pair acts as key , its value being a vector of all the values the key is making a pair with. Now I iterate from 1 till N(stack) and for each stack , I iterate through the keys which are less than or equal to the position of that stack . For each key , I binary search to find out In how many pairs my current stack is falling into. Finally I sort the array and the find the median.

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