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:66:22: 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:104:22: 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:150:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ^ user.cpp:180:14: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<sol; ^