HAPPY - v3: fread_unlocked

#include <stdio.h>

int squares[10] = {0,1,4,9,16,25,36,49,64,81};

int f( int n ){
  int result = 0;
  while( n ) {
    result += squares[ n%10 ];
    n /= 10;
  }
  return result;
}

int table[ 750 ];

int fillTable( int n ){
  if( table[n] != 0 ) return table[n];
  table[n] = -1;
  int d;
  if( (d = fillTable( f(n) ) ) != -1 ) d++;
  return( table[n] = d );
}

inline void initTable(){
  for( int i = 0; i < 750; i++ ) table[ i ] = 0;
  table[ 1 ] = 1;
  for( int i = 2; i < 750; i++ ) fillTable( i );
}

char line[ 32 ];

char wholeContent[ 12960000 ];
char *p = wholeContent;

inline int getFn(){
  int result = 0;
  while((*p < '0') || (*p >'9')) p++;
  while((*p >= '0')&&(*p<='9')) result += squares[ (*(p++))-'0' ];
  return result;
}

int main( int argc, char* argv[] ){
  initTable();
  int t,n;
  scanf( "%d\n",&t);
  fread_unlocked( wholeContent, 1, 12960000, stdin );
  while( t-- ){
    printf("%d\n", table[ getFn() ] );
  }
  return 0;
}