Compilare: user.c: In function ‘main’: user.c:27:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(fc, 0, sizeof fc); ^ user.c:27:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:42:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] memset(comb[0], 0, sizeof comb[0]); ^ user.c:24:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &n); ^ user.c:26:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, MAXL + 2, in); ^