Palindrome Numbers (LA2889) The nth palindrome number is?

J-palindrome Numbers

Time Limit: 3000MS Memory Limit:0KB 64bit IO Format:%lld &%llu

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#include <stdio.h> #define LL long long#define MM 2000000000LL num[25]= {0};    ll Ppow (ll X,ll y) {ll tp=1;    while (y--) {tp*=x; } return TP;}    void Init () {LL tp=9,i;    for (i=1;;)        {NUM[I]=NUM[I-1]+TP;        i++;//counterparts have multiple I to deal with the time I, do not put i++ inside, because the variation of the environment different, the sequence of operations may be WA NUM[I]=NUM[I-1]+TP;        i++;        tp=tp*10;    if (num[i-1]>=mm) break;    }/* for (int i=1;i<21;i++) {LL p= (i+1)/2-1;    Num[i]=num[i-1]+9*ppow (10,P);    printf ("%lld\n", Num[i]);    }//printf ("%lld\n", Num[0]); */}int main () {init ();    LL N;    LL A[20];        while (scanf ("%lld", &n), n) {int len=0;                for (int i=1; i<=20; i++) {if (N<=num[i]) {len=i;            Break        }}//printf ("len=%d\n", Len);        LL M=n-num[len-1];        int l= (len+1)/2;//printf ("m=%lld\tl=%d\n", m,l); LL Ans=ppow (10,L-1) +m-1;//printf ("ans=%lld\tppow=%lld\n", ans,pPow (10,L-1));        printf ("%lld", ans);        if (len&1) ans/=10;            while (ans) {printf ("%lld", ans%10);        ans/=10;    } printf ("\ n"); } return 0;}

Palindrome Numbers (LA2889) The nth palindrome number is?