Compilare: user.cpp: In function ‘void ReadInt(int*)’: user.cpp:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void ReadInput()’: user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void Query(int)’: user.cpp:71: warning: unused variable ‘k’ user.cpp: In function ‘void Update(int, int)’: user.cpp:120: warning: unused variable ‘k’ user.cpp: In function ‘void PrecomputeAnswers()’: user.cpp:137: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void ProcessQueries()’: user.cpp:194: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result