Compilare: user.cpp: In function ‘void _read()’: user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int resolve(int)’: user.cpp:92: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp: In function ‘int checkzone(int)’: user.cpp:137: warning: control reaches end of non-void function