Compilare: user.c: In function ‘main’: user.c:9:2: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] char* t = malloc((n + 2) * sizeof(char)); ^ user.c:9:12: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] char* t = malloc((n + 2) * sizeof(char)); ^ user.c:10:2: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(t, 0, sizeof(*t)); ^ user.c:10:2: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:6:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^