Compilare: user.cpp: In function ‘void readdata()’: user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void buildtree()’: user.cpp:74: warning: unused variable ‘p’ user.cpp: In function ‘void compute(long int*, long int*, long int*, long int*, long int, long int*)’: user.cpp:172: warning: unused variable ‘p’ user.cpp: In function ‘void outputdata()’: user.cpp:231: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘long int locate(long int*, long int)’: user.cpp:105: warning: ‘poz’ may be used uninitialized in this function