UVa 11549 Calculator Conundrum(STL map)
来源:互联网 发布:淘宝团队代卖产品 编辑:程序博客网 时间:2024/06/10 09:16
题目链接:点击打开链接
题目大意:一个计算器,只能保留n位(每次计算结果的前n位),然后某天你很无聊,想知道从某个数到某个数的范围之间,将这个范围内每个数平方以后计算器上显示的数的最大值是多少。
解题思路:没多想,果断用STL库里的map水过... 没想到还真的可以,而且代码还很短!
#include <iostream>#include <cmath>#include <map>#include <algorithm>#define LL long longusing namespace std;map <LL,LL> cal;int main(){ int t; LL n,k,mmax; cin >> t; while(t--) { cal.clear(); cin >> n >> k; mmax=k; while(!cal.count(k)) { cal[k]++; k*=k; LL temp=pow(10,n); while(k>=temp) k/=10; mmax=max(mmax,k); } cout << mmax << endl; } return 0;}
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