Compilare: user.c: In function ‘main’: user.c:14:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.c:17:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &mat[l][c]); ^ user.c:19:21: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] aux[0][0]=mat[l][c]; ^