Compilare: main.cpp: In function 'int main()': main.cpp:11:11: warning: unused variable 'c' [-Wunused-variable] int l,c,n,i,j,k,a[260][260]; ^ main.cpp:11:21: warning: variable 'a' set but not used [-Wunused-but-set-variable] int l,c,n,i,j,k,a[260][260]; ^ main.cpp:20:13: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] for (j=0;j<l;j++) { ~^~