Compilare: user.cpp: In function ‘int main()’: user.cpp:37:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:40:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i][j]); ^ user.cpp:52:27: warning: ‘ymax’ may be used uninitialized in this function [-Wmaybe-uninitialized] reconstruire(xmax,ymax); ^ user.cpp:52:27: warning: ‘xmax’ may be used uninitialized in this function [-Wmaybe-uninitialized]