Compilare: main.cpp: In function 'int main()': main.cpp:9:13: warning: unused variable 'a' [-Wunused-variable] 9 | int n,m,a,el,semn=0,nr=0,col=1,lin=1,ok=0; | ^ main.cpp:9:15: warning: unused variable 'el' [-Wunused-variable] 9 | int n,m,a,el,semn=0,nr=0,col=1,lin=1,ok=0; | ^~ main.cpp:9:42: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 9 | int n,m,a,el,semn=0,nr=0,col=1,lin=1,ok=0; | ^~