{{ message }}

Instantly share code, notes, and snippets.

# hueitan/trailing_zero.md

Last active Aug 29, 2015
trailing zero problem (superfactorial) - https://codefights.com/feed/ZKW6FzW8Rjj9wTLWo
```function superfactorialZeros(N) {
var result = 0;
for (i = 1; i <= N; i++) {
result += zeroes(i);
}

return result;
}

function zeroes(n) {
var i = 1;
var result = 0;
while (n >= i) {
i *= 5;
result += Math.floor(n / i);
}
return result;
}

// alternative of zeroes
var zeroes = function z(n)  {
k = n/5 | 0
return k ? k + f(k) : 0
}
// or
function zeroes (n) {
s = 0
while (n/=5) s += n|0
return s
}```

79 char

```function superfactorialZeros(N) {
R = 0

for (; N ; N--)
for (j = 5; N >= j; j *= 5)
R += N / j | 0

return R
}```

76 char

```function superfactorialZeros(N) {
R = 0

while (n=N--)
while(n>=5)
R += (n/=5)|0

return R
}```

well... 71 cahr

```function superfactorialZeros(N) {
R = 0

while (j = N--)
while (j /= 5)
R += j & j

return R
}```

### hueitan commented May 6, 2015

 Really learn a lot!