src.cpp:3:31: error: size of array 'a' is too large
long long int a[100000][100000];
^
src.cpp: In function 'int ocsen(int, int)':
src.cpp:7:5: error: 'a' was not declared in this scope
a[x][y]=1;
^
src.cpp: In function 'int main()':
src.cpp:22:10: error: 'a' was not declared in this scope
cin>>a[i][j];
^