Compilare: user.cpp: In function ‘int main()’: user.cpp:31:12: warning: unused variable ‘test’ [-Wunused-variable] double test; ^ user.cpp:32:23: warning: unused variable ‘retinmin’ [-Wunused-variable] int n, sol=0, nr, retinmin, retinmax; ^ user.cpp:32:33: warning: unused variable ‘retinmax’ [-Wunused-variable] int n, sol=0, nr, retinmin, retinmax; ^ user.cpp:34:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:38:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lf %lf", &pct[i].x, &pct[i].y); ^