Eroare de compilare: user.cpp:5:13: error: variable ‘std::ifstream fin’ has initializer but incomplete type ifstream fin("algsort.in"); ^ user.cpp:6:14: error: variable ‘std::ofstream fout’ has initializer but incomplete type ofstream fout("algsort.out"); ^ user.cpp: In function ‘int main()’: user.cpp:12:8: warning: unused variable ‘v’ [-Wunused-variable] int n,v[500001]; ^ user.cpp: In function ‘void fcmp(const void*, const void*)’: user.cpp:18:11: error: invalid use of ‘const void’ return a-b; ^ user.cpp:18:11: error: return-statement with a value, in function returning 'void' [-fpermissive]