Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:32:5: error: ‘ifstream’ was not declared in this scope ifstream fin("heavytask.in"); ^~~~~~~~ user.cpp:32:5: note: suggested alternative: In file included from /usr/include/c++/6/ios:38:0, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/6/iosfwd:162:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^~~~~~~~ user.cpp:33:5: error: ‘ofstream’ was not declared in this scope ofstream fout("heavytask.out"); ^~~~~~~~ user.cpp:33:5: note: suggested alternative: In file included from /usr/include/c++/6/ios:38:0, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/6/iosfwd:165:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^~~~~~~~ user.cpp:35:5: error: expected initializer before ‘long’ long long int k,a,b; ^~~~ user.cpp:36:5: error: ‘fin’ was not declared in this scope fin >> t; ^~~ user.cpp:47:17: error: ‘k’ was not declared in this scope k = gcd(v[i],v[j]); ^ user.cpp:48:17: error: ‘a’ was not declared in this scope a = gcd(v[i] / k,k); ^ user.cpp:49:17: error: ‘b’ was not declared in this scope b = put(k,a); ^ user.cpp:54:13: error: ‘fout’ was not declared in this scope fout << v[i] << '\n'; ^~~~ user.cpp:34:13: warning: unused variable ‘i’ [-Wunused-variable] int n,t,i,j ^