Compilare: user.c: In function ‘find’: user.c:27:16: warning: operation on ‘ss’ may be undefined [-Wsequence-point] boss[stack[--ss].l][stack[ss].c] = root; ^ user.c: In function ‘main’: user.c:82:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &K); ^ user.c:84:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hd %hd", &tree.l, &tree.c); ^