carti2.cpp: In function 'bool sorting(eu, eu)': carti2.cpp:9: warning: suggest parentheses around '&&' within '||' carti2.cpp: In function 'void back(int)': carti2.cpp:19: warning: unused variable 'pp' carti2.cpp: In function 'int main()': carti2.cpp:62: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result carti2.cpp:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result carti2.cpp:65: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result carti2.cpp:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result