Compilare: user.cpp: In function ‘int main()’: user.cpp:69:15: warning: unused variable ‘r1’ [-Wunused-variable] long long r1, r2; ^ user.cpp:69:19: warning: unused variable ‘r2’ [-Wunused-variable] long long r1, r2; ^ user.cpp:54:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("disconnect.in", "r", stdin); ^ user.cpp:55:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("disconnect.out", "w", stdout); ^ user.cpp: In function ‘void cit(int&)’: user.cpp:13:46: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (ax, 1, dim, stdin), pz = 0; ^ user.cpp:17:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(ax, 1, dim, stdin), pz = 0; ^