Compilare: user.cpp: In function ‘void Precalculate()’: user.cpp:20:15: warning: unused variable ‘x’ [-Wunused-variable] int i, j, x, l; ^ user.cpp: In function ‘void Read()’: user.cpp:15:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &W, &H, &N); ^ user.cpp: In function ‘void Answer()’: user.cpp:36:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &query); ^