Compilare: main.cpp: In function 'int main()': main.cpp:25:10: warning: unused variable 'up' [-Wunused-variable] int n, up, right; ^~ main.cpp:25:14: warning: unused variable 'right' [-Wunused-variable] int n, up, right; ^~~~~ main.cpp:27:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:29:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lf%lf", &x[i], &y[i]); ^