Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:40:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%d", &r, &m); ^ user.cpp:43:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%lf%lf%lf", &xx1, &yy1, &xx2, &yy2); ^ user.cpp: In function ‘int main()’: user.cpp:58:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^