Factorial Trailing Zeroes
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``` java
public class Solution {
public int trailingZeroes(int n) {// ref http://www.danielbit.com/blog/puzzle/leetcode/leetcode-factorial-trailing-zeroes
if(n<0) return -1;
int res = 0;
for(long i=5; n/i>=1; i *= 5){
res += n/i ;
}
return res;
}
}
// // why 下面的對
// public class Solution {
// public int trailingZeroes(int n) {
// int count = 0;
// while(n>=5) {
// n /= 5;
// count += n;
// }
// return count;
// }
// }
0 0
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