Compilare: user.cpp: In function ‘void range()’: user.cpp:25: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:26: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:33: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:34: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp: In function ‘int main()’: user.cpp:78: warning: integer overflow in expression user.cpp:67: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:68: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:74: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result