Compilare: main.cpp:3: warning: ignoring '#pragma optimize GCC' [-Wunknown-pragmas] 3 | #pragma optimize GCC ("Ofast") | main.cpp: In function 'void solve_line()': main.cpp:62:11: warning: unused variable 'j' [-Wunused-variable] 62 | int i,j; | ^ main.cpp: In function 'void solve_column()': main.cpp:79:11: warning: unused variable 'j' [-Wunused-variable] 79 | int i,j; | ^ main.cpp: In function 'int main()': main.cpp:100:11: warning: unused variable 'j' [-Wunused-variable] 100 | int i,j; | ^