Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:17:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(v1[1]==0 && v1[i]!=0 || v1[1]!=0 && v1[i]==0) ^ user.cpp:25:21: error: ‘a’ was not declared in this scope a[k][1]=i; ^ user.cpp:30:21: error: ‘a’ was not declared in this scope a[k][1]=1; ^ user.cpp:43:31: error: ‘a’ was not declared in this scope fout<<a[j][1]<<" "<<a[j][2]<<'\n'; ^