Compilare: user.c: In function ‘main’: user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &nrlin, &nrcol); ^ user.c:12:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(&a[1], MAXN+3, fin); ^ user.c:27:9: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(2*ans<=nrcol){ ^