Compilare: user.cpp: In function ‘int main()’: user.cpp:16:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:19:45: 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]); ^ user.cpp:65:77: warning: ‘retinmax’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol += abs(-a[retinmin][retinmax]+a[retinmin][i+j+k-retinmin-retinmax]+a[retinmax][i+j+k-retinmin-retinmax]); ^ user.cpp:65:86: warning: ‘retinmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol += abs(-a[retinmin][retinmax]+a[retinmin][i+j+k-retinmin-retinmax]+a[retinmax][i+j+k-retinmin-retinmax]); ^