Compilare: main.c: In function 'main': main.c:11:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:7: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:42:15: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] while(v[i][j]!=-1 && i<=n){ ~~~~^~~