Eroare de compilare: user.cpp: In function ‘void backtrack(int)’: user.cpp:25:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid(p)) if((p==N)&& (ciur[st[1]+st[p]]==0)) contor++; ^ user.cpp: In function ‘int main()’: user.cpp:33:5: error: ‘fin’ was not declared in this scope fin>>N; ^ user.cpp:45:23: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(i=4;i<=n;i=i+=2) ciur[i]=1; ^