Compilare: main.cpp: In function 'int devolver1(int)': main.cpp:45:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(prim(s)==0&&prim(1+st[1])==0||prim(s)==0&&prim(1+st[1])==1||prim(s)==1&&prim(1+st[1])==0) ~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:45:75: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(prim(s)==0&&prim(1+st[1])==0||prim(s)==0&&prim(1+st[1])==1||prim(s)==1&&prim(1+st[1])==0) ~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int backtracking(int)': main.cpp:60:3: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(devolver(k)==1&&devolver1(k)==1) ^ main.cpp:65:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^