Main.cc: In function 'int main()':
Main.cc:6:18: error: variable-sized object 'a' may not be initialized
int a[n][n]={};
^
Main.cc:15:13: error: 'c' was not declared in this scope
c+a[i][j];
^
Main.cc:24:13: error: 'c' was not declared in this scope
c+a[i][j];
^