Compilare: main.cpp: In function 'void back(int)': main.cpp:32:3: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(cont(k))if(k==n){if(sol(k)&&ok==0){ok=1;afis();}} ^ main.cpp: In function 'int main()': main.cpp:38:21: warning: unused variable 'i' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:23: warning: unused variable 'j' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:25: warning: unused variable 'z' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:27: warning: unused variable 's' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:31: warning: unused variable 'sa' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^~ main.cpp:38:36: warning: unused variable 'x' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:38: warning: unused variable 'loc' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^~~ main.cpp:38:44: warning: unused variable 'y' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^ main.cpp:38:46: warning: unused variable 'q' [-Wunused-variable] {unsigned long long i,j,z,s=1,sa=0,x,loc=0,y,q;; ^