Compilare: user.cpp: In function ‘int main()’: user.cpp:32:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:32:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:32:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:35:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^ user.cpp:47:29: warning: ‘yi’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[u].x=xi; c[u].y=yi; ^ user.cpp:47:18: warning: ‘xi’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[u].x=xi; c[u].y=yi; ^