Compilare: user.cpp: In function ‘int main()’: user.cpp:11:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0,x;i<s.length();i++){ ^ user.cpp:13:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i+1;j<s.length();j++)x*=B[s[j]-'0']; ^ user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for(int i = 0;i<s.length();i++) rs+=S[s[i]-'0']; ^