Eroare de compilare: user.cpp: In function ‘int dei(int)’: user.cpp:20:33: error: ‘solve’ was not declared in this scope return a*a-solve(p-1)-1; ^ user.cpp:28:35: error: ‘solve’ was not declared in this scope return 4*a*a-solve(p-1)-1; ^ user.cpp:36:33: error: ‘solve’ was not declared in this scope return a*a+solve(p-1); ^ user.cpp:42:35: error: ‘solve’ was not declared in this scope return 2*a*a+solve(p-1); ^ user.cpp:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^