Compilare: user.cpp: In function ‘int memo(int, int, int)’: user.cpp:19: warning: unused variable ‘l’ user.cpp:19: warning: unused variable ‘r’ user.cpp: In function ‘int main()’: user.cpp:80: warning: unused variable ‘k’ user.cpp:72: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:73: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:74: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result