Compilare: user.cpp: In function ‘int main()’: user.cpp:51:13: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.cpp:51:16: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.cpp:48:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:52:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &chii[i].a, &chii[i].b); ^