Compilare: user.cpp: In function ‘int main()’: user.cpp:137:17: warning: unused variable ‘q1’ [-Wunused-variable] int q1 = Q(intrv[ qnod[ind] ][1]); ^ user.cpp:138:17: warning: unused variable ‘q2’ [-Wunused-variable] int q2 = Q(intrv[ qnod[ind] ][0] - 1); ^ user.cpp: In function ‘char gchar()’: user.cpp:14:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, buffer, 1, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:91:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb.in", "r", stdin); ^ user.cpp:92:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb.out", "w", stdout); ^