uva 10591- Happy Number

#include <cstdio>#include <iostream>#include <cstring>#include <list>#include <algorithm>using namespace std;int vis[1000];int solve(int n){    int sum = 0;    while(n>0)    {        sum += (n%10)*(n%10);        n /= 10;    }    return sum;}int main(){    int n, x, casen = 1;    cin >> n;    while(n--)    {        cin >> x;        memset(vis, 0, sizeof(vis));        int m = x;        while(x)        {            m = solve(m);            if(m == 1)            {                printf("Case #%d: %d is a Happy number.\n", casen++, x);                break;            }            if(vis[m])            {                printf("Case #%d: %d is an Unhappy number.\n", casen++, x);                break;            }            vis[m] = 1;        }    }    return 0;}