Compilare: user.cpp: In function ‘int par_dreapta(int&)’: user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=f;i<s.size();++i) ^ user.cpp: In function ‘int sum(int)’: user.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=f;i<s.size();++i) ^ user.cpp: In function ‘int par_simplu(int&)’: user.cpp:106:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=f;i<s.size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:152:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ^ user.cpp:182:14: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<sol; ^