Compilare: user.c: In function ‘main’: user.c:7:9: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(c,0,sizeof(c)); ^ user.c:7:9: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:10:9: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration] c[0]=i-1,memcpy(a,b,sizeof(b)),memcpy(b,c,sizeof(c)); ^ user.c:10:18: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] c[0]=i-1,memcpy(a,b,sizeof(b)),memcpy(b,c,sizeof(c)); ^ user.c:5:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("nunta.in","r",stdin),freopen("nunta.out","w",stdout),scanf("%hd",&n),c[0]=c[1]=a[0]=b[0]=a[1]=b[1]=1; ^ user.c:5:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("nunta.in","r",stdin),freopen("nunta.out","w",stdout),scanf("%hd",&n),c[0]=c[1]=a[0]=b[0]=a[1]=b[1]=1; ^ user.c:5:72: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("nunta.in","r",stdin),freopen("nunta.out","w",stdout),scanf("%hd",&n),c[0]=c[1]=a[0]=b[0]=a[1]=b[1]=1; ^