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| Time Limit: 1000MS | Memory Limit: 10000K | |
| Total Submissions: 108445 | Accepted: 52837 |
How far can you make a stack of cards overhang a table? If you have one card, you can create a maximum overhang of half a card length. (We‘re assuming that the cards must be perpendicular to the table.) With two cards you can make the top card overhang the bottom one by half a card length, and the bottom one overhang the table by a third of a card length, for a total maximum overhang of 1/2 + 1/3 = 5/6 card lengths. In general you can make n cards overhang by 1/2 + 1/3 + 1/4 + ... + 1/(n + 1) card lengths, where the top card overhangs the second by 1/2, the second overhangs tha third by 1/3, the third overhangs the fourth by 1/4, etc., and the bottom card overhangs the table by 1/(n + 1). This is illustrated in the figure below.
1.00
3.71
0.04
5.19
0.00
3 card(s)
61 card(s)
1 card(s)
273 card(s)
CODE：
#include <iostream> #include <cstdio> #include <cstring> #define REP(i, s, n) for(int i = s; i <= n; i ++) #define REP_(i, s, n) for(int i = n; i >= s; i --) #define MAX_N 300 + 10 using namespace std; int main(){ double n; while(cin >> n){ if(n == 0.00) break; int tmp = 1; double sum = 0; while(sum < n){ sum += (double) 1 / ++ tmp; } tmp --; printf("%d card(s)\n", tmp); } return 0; }
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原文地址：http://www.cnblogs.com/ALXPCUN/p/4519286.html
