Compilare: main.cpp: In function 'void punin()': main.cpp:61:10: warning: unused variable 'x' [-Wunused-variable] char x; ^ main.cpp: In function 'bool valid(long int, long int, long int)': main.cpp:70:25: warning: statement has no effect [-Wunused-value] if(n1!=1&&n2!=1) val&&(nr1[n1-1]!=sum[s-1]&&nr2[n2-1]!=sum[s-1]); ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~