Compilare: main.c: In function 'main': main.c:40:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^~~~~~~~~~~~~~~~~~~ main.c:43:7: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:36:20: warning: 'pj' may be used uninitialized in this function [-Wmaybe-uninitialized] int i,j,n,max,pi,pj; ^~ main.c:36:17: warning: 'pi' may be used uninitialized in this function [-Wmaybe-uninitialized] int i,j,n,max,pi,pj; ^~ main.c:64:3: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d\n",max+1); ^~~~~~~~~~~~~~~~~~~~~~~~~~