Compilare: main.c: In function 'main': main.c:12:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &n, &l, &u ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &nr ); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:15: warning: 'dr' is used uninitialized in this function [-Wuninitialized] dr = dq[dr] = 1; ~~~~~~~^~~ main.c:10:23: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, l, u, nr, i, st, dr, max; ^~