You are given a dimensional array of integers of size . We will call this array . You are then required to answer multiple queries for the minimum integer in a given submatrix.
Formally, given integers , determine .
Implementation Details
You should implement the following functions:
void init(std::vector<std::vector<int>> arr);
 : a dimensional array of size .
int query(int a, int b, int c, int d);
 : the lower bound on the first dimension of the submatrix.
 : the upper bound on the first dimension of the submatrix.
 : the lower bound on the second dimension of the submatrix.
 : the upper bound on the second dimension of the submatrix.
 This function should return the minimum integer in the submatrix formed by .
It is guaranteed that init
will be called exactly once, and that this call will be made before any calls to query
.
Constraints
For all subtasks:
for
for all calls to query
for all calls to query
Disclaimer: were generated randomly.
Your answer will be considered correct if the bitwise of the answers to all the queries matches the expected result.
Subtask 1 [10%]
query
will be called at most times.
Subtask 2 [20%]
query
will be called at most times.
Subtask 3 [30%]
query
will be called at most times.
Subtask 4 [40%]
query
will be called at most times.
Sample Interaction
Please note that the sample will not appear in any of the test cases.
Function Call  Return Value 

init({{1, 2}, {3, 4}}) 

query(0, 1, 0, 1) 
1 
query(1, 1, 0, 1) 
3 
query(0, 0, 1, 1) 
2 
Comments
DO NOT have debug output in your
init()
function or you will get WAMy 2D sparse table TLEs on the last subtask. How can I optimise my code?
Swapping the dimensions of the sparse table (ie. putting the smaller dimensions first) fixed my code when I got TLE on the last batch. It seems that this also allows your solution to pass.
Thanks, that worked!
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I got
RTE (failed initializing)
when submitting my code but after resubmitting the same code it got ACSounds like undefined behaviour :(