Compilare: user.c: In function ‘main’: user.c:86:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(tr, 0, sizeof tr); ^ user.c:86:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:60:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d ", &m, &n); ^ user.c:68:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, MAXL + 2, in); ^ In file included from /usr/include/stdio.h:934:0, from user.c:1: In function ‘fgets’, inlined from ‘main’ at user.c:68:10: /usr/include/i386-linux-gnu/bits/stdio2.h:253:2: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer [enabled by default] return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^