Compilare: user.cpp: In function ‘int main()’: user.cpp:23:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d\n%d\n", &N, &M, &Lmax); ^ user.cpp:26:60: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &a[i][j]), ef[i][j]=(double)inf; ^ user.cpp:27:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d", &li, &ci, &lf, &cf); ^