Compilare: user.cpp: In function ‘int findmax(int)’: user.cpp:11:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k+1;i<s.size();i++) if (s[i]>s[k]) return i; ^ user.cpp: In function ‘int main()’: user.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++){ ^ user.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) fout<<s[j]; ^