【HDOJ5978】To begin or not to begin（概率）

题意：有k个黑球和1个红球，两个轮流抽，抽到红球算赢，问先手赢的概率大还是后手大还是相等

k<=1e5

思路：手算前几项概率

大胆猜想

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<string>
 4 #include<cmath>
 5 #include<iostream>
 6 #include<algorithm>
 7 #include<map>
 8 #include<set>
 9 #include<queue>
10 #include<vector>
11 using namespace std;
12 typedef long long ll;
13 typedef unsigned int uint;
14 typedef unsigned long long ull;
15 typedef pair<int,int> PII;
16 typedef vector<int> VI;
17 #define fi first
18 #define se second 
19 #define MP make_pair
20 #define N   110000
21 #define MOD 1000000007
22 #define eps 1e-8 
23 #define pi acos(-1)
24 
25 
26 int n;
27 
28 int read()
29 { 
30    int v=0,f=1;
31    char c=getchar();
32    while(c<48||57<c) {if(c=='-') f=-1; c=getchar();}
33    while(48<=c&&c<=57) v=(v<<3)+v+v+c-48,c=getchar();
34    return v*f;
35    
36 }
37 
38 
39 int main()
40 {
41     //freopen("H.in","r",stdin);
42     //freopen("H.out","w",stdout);
43     while(scanf("%d",&n)!=EOF)
44     {
45         if(n%2) printf("0\n");
46          else printf("1\n");
47     }
48     return 0;
49 }

 

posted on 2018-10-06 16:30  myx12345  阅读(135)  评论(0)  编辑  收藏  举报

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