There is no spoon: Segmentation error !?!?

Puzzles
#1

Hello everybody,

I have this message error:

Segmentatio error, at this line:

vector<vector<string>>  grille;

…
…
…

if (grille[i][j] == "0") return true;
                     ^

…
…
I dont know why ?

Thanks

#2

I don’t which language you are using.

#3

And what’s the size of grille?

#4

When in doubt, use at().

if ( grille.at(i).at(j) == "0" ) return true;
#6

It’s ok. thanks a lot. Excuse my english, I am french…