Anonymous

Maybe you will try this code

Berkus

a C one-liner?

Compilation

#include <iostream> #include <set> int main() { //decl std::set<int> row[9]; std::set<int> column[9]; std::set<int> box[9]; //read & store for (int i = 0; i < 9; ++i) { for (int j = 0; j < 9; ++j) { int val; std::cin >> val; if ((val >= 1) && (val <= 9)) { row[i].insert(val); column[j].insert(val); int k = j / 3 + i / 3 + i / 3 + i / 3; box[k].insert(val); } } } //check bool l = true; int i = 0; while (l && i < 9) { l = row[i].size() == 9; ++i; } if (!l) std::cout << "NO" << std::endl; else { bool l = true; int i = 0; while (l && i < 9) { l = column[i].size() == 9; ++i; } if (!l) std::cout << "NO" << std::endl; else { bool l = true; int i = 0; while (l && i < 9) { l = box[i].size() == 9; ++i; } if (!l) std::cout << "NO" << std::endl; else std::cout << "YES" << std::endl; } } return 0;

Thanks thats great effort

Compilation

I didnt understand what does this step does int k = j / 3 + i / 3 + i / 3 + i / 3; box[k].insert(val); } } }

Compilation

I guess you are concerning a single 3x3 block right?

Compilation

So ill be thankful if you explain to me how it works

Anonymous

Of course after while ok? Coz right now i cant due to some problems

Compilation

Ok thanks

Anonymous

Can someone explain the difference netween return this and return *this in c++

Anonymous

Please 😭

Berkus

return this; returns a pointer, return *this; returns a reference

Anonymous

I am struggling to run this file

Anonymous

Can you help

Anonymous

Isn't it possible to link or connect data file?

Anonymous

return this; returns a pointer, return *this; returns a reference

Thank u so much..I actually found this ambiguity in operator= overload .

Anonymous

return this; returns a pointer, return *this; returns a reference

Im sorry but i ha e one more quest when we say reference does that mean the content of the pointer?

Berkus

there's no real reason to return *this by value

Berkus

Im sorry but i ha e one more quest when we say reference does that mean the content of the pointer?

T& is a reference T* is a pointer

Berkus

technically they're the same thing

Berkus

in case of this they're pretty much equivalent, because this can't be null

Григорий

Does it in C work differently?

Anonymous

Im lost honestly is there a simple example ?thank u

Anonymous

I cant distinguish :/

Berkus

Does it in C work differently?

there is no this in C, so it doesn't work

Berkus

yes, it's great

Berkus

Im lost honestly is there a simple example ?thank u

T& operator =(T const& other) { this->v = other.v; return *this; } // return reference to allow chaining

Anonymous

T& operator =(T const& other) { this->v = other.v; return *this; } // return reference to allow chaining

Excuse my slow mind xD what is chaining

Berkus

Excuse my slow mind xD what is chaining

a = b = c;

Anonymous

Thank u both

Anonymous

I love u guyd

Anonymous

I understood

Anonymous

😁

Anonymous

So the chaining guarentees that b copies c 's values by ref ..same for a right?

Berkus

no

Anonymous

http://www.cplusplus.com/forum/general/135589/

Anonymous

I read this about chaining it didnt help that much ..

Anonymous

Could u please tell me what it is..thank u

Berkus

let's say it's not related to returning this by pointer or by reference

Anonymous

😂 brief is chaining important?

Anonymous

Where the tutors at?

Roxifλsz 🇱🇹

a = b = c goes from right to left while the stream operators go from left to right

Roxifλsz 🇱🇹

You probably could get the same result if you used stream operators to the other side (»)

Roxifλsz 🇱🇹

= and << are not the same, they're used for different purposes

Anonymous

My controversial question has made buzz

Anonymous

I have another one for u ..except its not related to C..its about OS.

Anonymous

Ignore the french comments xD

Anonymous

This is my algorithm

Anonymous

We have a critical section here. I dont understand the while loop..

Anonymous

I will translate if u want

Isc

no locks, no guards

Isc

This will explode

Anonymous

No its our professor course

Anonymous

I asked him he never answered clearly

Anonymous

Ignore the photo that i ve sent ... how peterson algorithm actually works ..i lost the idea 😔

Anonymous

This is better

Anonymous

My question is how the second while loop works?

Anonymous

And why pAtrying=False..doesnt that block A ..

Anonymous

Plz rescue me xD .. does anyone have any idea bout this ill be so gratefull

Álvaro

better than dekker?

Anonymous

I really do not care what the owner of the pic says x) i just want to understande the algorithm..when i look at this pic and check my course I find conflicts a lot of contradiction

Anonymous

The problem is tht our professor inverted the 2nd while loop of process A..he says while(pBtryin and Turn =A)

Anonymous

This is wrong! Because we give the turn to B and if B is interested in Critical section and has the turn A will wait till the while loop ceases! Except my stupid professor sucks at explanation and ruin our minds with his irrational BS

Anonymous

I know ...easy stuff seem to appear easy but their depth and meaning requires effort ..so it doesnt seem retarded to me..i just wanna know if our teacher is correct or not

Anonymous

And here is his version

Anonymous

Entrer-sc is the function that allows us to get into Critical section

Anonymous

Ok forget about all what i ve mentionned above here is my isuue..what If process B still wants to be in critical zone and at the same time its no longer its turn

Anonymous

I promise this will be my final quest