Compilare: user.c: In function ‘calc’: user.c:36:3: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(v, -1, sizeof v); ^ user.c:36:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘main’: user.c:81:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] memset(v, 0, sizeof v); ^ user.c:75:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &l, &h, &n); ^ user.c:77:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &x[i], &y[i], &r[i]); ^