Compilare: main.c: In function 'main': main.c:21:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while ( j < BSIZE && ( buf[j] >= '0' && buf[j] <= '9' || buf[j] == '-' ) ) { ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.c:12:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d ", &n ); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:5: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] fread( buf, 1, BSIZE, fin ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:3: warning: 'i3' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf( fout, "%lld %d %d", max, i3 + 1, j + 1 ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:3: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]