Eroare de compilare: user.cpp:4:13: error: variable ‘std::ifstream fin’ has initializer but incomplete type ifstream fin("sr.in"); ^ user.cpp:5:14: error: variable ‘std::ofstream fout’ has initializer but incomplete type ofstream fout("sr.out"); ^ user.cpp: In function ‘int main()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<b.size()-1) ^ user.cpp:9:9: warning: unused variable ‘n’ [-Wunused-variable] int n, i, j; ^