hello ,

i know i didn't totally listen to the editorial but i don't understand why my implementation could be wrong and why i get WA at test 9 on problem E of contest 896.

My implementation is 33780827.

i thought about keeping the square in which my element 1 and element 2 are and i am keeping it using a global variable k which i use to mark the square in which my element is. i am introducing new squares by increasing k and increasing by it, removing a square with a matrix whatwasthere and decreasing by the value of whatwasthere[line][column] of the first element of the query , and display yes if the square in which the first element is equals to the square in which the second element of the query is