Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13:5: error: ‘ifstream’ was not declared in this scope ifstream fin("arbori.in")>>N>>M>>K; ^ user.cpp:13:5: note: suggested alternative: In file included from /usr/include/c++/5/ios:38:0, from /usr/include/c++/5/istream:38, from /usr/include/c++/5/sstream:38, from /usr/include/c++/5/complex:45, from /usr/include/c++/5/ccomplex:38, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/5/iosfwd:162:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^ user.cpp:20:17: error: ‘ll’ was not declared in this scope ll sol = 1; ^ user.cpp:22:36: error: ‘sol’ was not declared in this scope dp[i][j][k] += sol * dp[i - l * k][mod (j - l)][k - 1]; ^ user.cpp:27:5: error: ‘ofstream’ was not declared in this scope ofstream fout("arbori.out")<<dp[N][K][N - 1]; ^ user.cpp:27:5: note: suggested alternative: In file included from /usr/include/c++/5/ios:38:0, from /usr/include/c++/5/istream:38, from /usr/include/c++/5/sstream:38, from /usr/include/c++/5/complex:45, from /usr/include/c++/5/ccomplex:38, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/5/iosfwd:165:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^