Compilare: user.c: In function ‘main’: user.c:18:7: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(d[i], 0, sizeof d[i]); ^ user.c:18:7: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:13:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%lld ", &n, &k); ^ user.c:16:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, n + 2, in); ^