concurs3.cpp:2: error: 'ifstream' does not name a type concurs3.cpp:3: error: 'ofstream' does not name a type concurs3.cpp: In function 'int main()': concurs3.cpp:8: error: 'fin' was not declared in this scope concurs3.cpp:18: error: 'fout' was not declared in this scope concurs3.cpp:20: error: 'fout' was not declared in this scope concurs3.cpp:29: error: 'fout' was not declared in this scope