解题思路:
乱糟糟的也算是终于做出来AC了,留下代码当个纪念吧
参考代码:
#include<bits/stdc++.h> using namespace std; string jia(string s1, string s2) { int n1 = s1.length(); int n2 = s2.length(); string ans = s1; if (n1 < n2) ans = s2; int n = ans.length(); int flag = 0; for (int i = 1; i <= n; i++) { int sum; if (i > n1) { sum = s2[n2 - i] - '0'; } else if (i > n2) { sum = s1[n1 - i] - '0'; } else sum = s1[n1 - i] + s2[n2 - i] - '0' - '0'; sum += flag; ans[n - i] = sum % 10 + '0'; flag = sum / 10; } if (flag > 0) { ans = '1' + ans; } return ans; } string cheng(string s, int n) { if (n == 0) return ""; if (n == 10) return s + '0'; int num = n % 10; string ans = s; int len = ans.length(); int flag = 0; for (int i = len - 1; i >= 0; i--) { int temp = ans[i] - '0'; temp *= num; temp += flag; flag = temp / 10; temp %= 10; ans[i] = temp + '0'; } if (flag > 0) ans = char(flag + '0') + ans; if (n > 10) ans = jia(ans, cheng(cheng(s, n / 10), 10)); return ans; } int main() { int n; cin >> n; string s = "1"; for (int i = 2; i <= n; i++) { s = cheng(s, i); } cout << s << endl; return 0; }
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