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Hashfunction - design a hash function for Leetcode 49
int Fun(string s, int l, int r)
var ret = new int[26];
for (int i = l; i <= r; i++)
ret[s[i] - 'a']++;
int x = 0; // Julia's comment: should be 1
for (int i = 0; i < 26; i++)
x = x * 701 + ret[i];
return x;
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