n!的长度等于log10(n!)
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#include <bits/stdc++.h>using namespace std;int main() { int n; cin >> n; double ans = 1; for(int i = 1; i <= n; i++) { ans += log10(i); } cout << (int)ans << endl;} |
原文：http://www.cnblogs.com/bestwzh/p/6637573.html