Borderou de evaluare (job #274292)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:7:17: error: ‘nr’ was not declared in this scope user.cpp:10:9: error: ‘k’ was not declared in this scope user.cpp:14:16: error: ‘pow’ was not declared in this scope user.cpp:20:7: error: expected unqualified-id before ‘.’ token user.cpp:22:10: error: ‘vector’ was not declared in this scope user.cpp:22:17: error: ‘n’ was not declared in this scope user.cpp:24:8: error: ‘x’ was not declared in this scope user.cpp:27:8: error: expected primary-expression before ‘<=’ token user.cpp:27:15: error: expected primary-expression before ‘>’ token user.cpp:28:13: error: ‘a’ was not declared in this scope