Main.cc: In function 'int main()':
Main.cc:11:11: error: expected ';' before '{' token
a1{j}=1;
^
Main.cc:11:13: warning: statement has no effect [-Wunused-value]
a1{j}=1;
^
Main.cc:11:14: error: expected primary-expression before '=' token
a1{j}=1;
^