**What happened to Legend Petr Mitrichev. Why he is not doing screencast of contests he gives. I really loved his SC's.** **It was very motivating.**

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**What happened to Legend Petr Mitrichev. Why he is not doing screencast of contests he gives. I really loved his SC's.** **It was very motivating.**

Why such strange behaviour while outputting the difference in sizes of two queues. When i am storing them in a diff variable its showing right answer, while just outputting the difference gives wrong answer.

```
#include<bits/stdc++.h>
using namespace std;
int main()
{
priority_queue<int , vector<int> , greater<int> > pmin;
priority_queue<int , vector<int> >pmax;
pmin.push(5);
pmin.push(9);
pmin.push(10);
pmax.push(1);
cout << pmax.size() - pmin.size() << endl;
int diff = pmax.size() - pmin.size();
cout << diff <<endl;
return 0 ;
}
```

**** **TO DV : Since downvotes doesn't affects me, but I think this is a very good question whom most of have no idea about the flaw in this. So it would be good if some good answers known to other people.**

the first solution which gets ac , also recur for all the four case , and my 2nd solution also recur for all four cases .

But why i am getting tle at TC 6 , is there something i am missing , or something which is increasing the time complexity of 2nd sol.

someone please tell the mistake .

In problem Equivalent string , I am using Divide and Conquer approach to solve.

I am checking all four cases , left_left , right_right , left_right , right_left

by the code is giving time limit exeeded . Since we are not making more than log n divisions , why it is giving TLE and how to optimize it . Can anyone tell me . Thanks

```
bool lefleft = solve(i1 , i1 + mid -1 , i2 , i2 + mid -1 ) ;
bool rightright = solve(i1 + mid , j1 , i2 + mid , j2 ) ;
bool leftright = solve(i1 , i1 + mid -1 , i2 + mid , j2 ) ;
bool rightleft = solve(i1+ mid , j1 , i2 , i2 + mid -1 ) ;
if(lefleft == true and rightright == true ) {
return true ;
}
if(leftright == true and rightleft == true ) {
return true ;
}
else return false ;
```

**In problem , symmetric grid , can anyone give the proof why the method given in the editorial works . how to perform all rows and column swapping operation .**

*Anyone .*

can someone guide me how to use topcoder arena for competitive programming. i wanna participate in toc. rounds but its arena is too tough to handle .

and how to view other solutions at topcoder? Please tell. help would be appreciated. Thanks!

suppose u have to find a % b , i see many red coders solution instead of using directly a%b they do like ..

if (a >=mod) a-=mod ??

why so ?

how to solve problem 27D .

Can anyone please help me in solving lizards and basement 2 ? link

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