Compilare: main.cpp: In function 'int main()': main.cpp:9:9: warning: unused variable 'a' [-Wunused-variable] int a,n,c,d,e=-1,ok=1,i,j; ^ main.cpp:9:13: warning: unused variable 'c' [-Wunused-variable] int a,n,c,d,e=-1,ok=1,i,j; ^ main.cpp:9:22: warning: unused variable 'ok' [-Wunused-variable] int a,n,c,d,e=-1,ok=1,i,j; ^~ main.cpp:40:9: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized] ap[d-'0']++; ~^~~~