Compilare: user.cpp: In function ‘int main()’: user.cpp:9:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:12:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c[i][j]); ^ user.cpp:38:12: warning: ‘w’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d %d %d %d\n",w,inc[w],min+1,e); ^