Eroare de compilare: user.cpp:22: error: ISO C++ forbids declaration of ‘valid_position’ with no type user.cpp: In function ‘void find_islands()’: user.cpp:51: error: ‘islandR’ was not declared in this scope user.cpp:51: error: ‘islandG’ was not declared in this scope user.cpp:51: error: ‘islandB’ was not declared in this scope user.cpp: In function ‘bool valid_position(int, int)’: user.cpp:81: error: new declaration ‘bool valid_position(int, int)’ user.cpp:22: error: ambiguates old declaration ‘int valid_position(int, int)’ user.cpp: At global scope: user.cpp:22: warning: inline function ‘int valid_position(int, int)’ used but never defined