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Drazil has many friends. Some of them are happy and some of them are unhappy. Drazil wants to make all his friends become happy. So he invented the following plan.
There are n boys and m girls among his friends. Let‘s number them from 0 to n - 1 and 0 to m - 1 separately. In i-th day, Drazil invites 
-th boy and 
-th girl to have dinner together (as Drazil is programmer, i starts from 0). If one of those two people is happy, the other one will also become happy. Otherwise, those two people remain in their states. Once a person becomes happy (or if he/she was happy originally), he stays happy forever.
Drazil wants to know whether he can use this plan to make all his friends become happy at some moment.
The first line contains two integer n and m (1 ≤ n, m ≤ 100).
The second line contains integer b (0 ≤ b ≤ n), denoting the number of happy boys among friends of Drazil, and then follow b distinct integers x1, x2, ..., xb (0 ≤ xi < n), denoting the list of indices of happy boys.
The third line conatins integer g (0 ≤ g ≤ m), denoting the number of happy girls among friends of Drazil, and then follow g distinct integers y1, y2, ... , yg (0 ≤ yj < m), denoting the list of indices of happy girls.
It is guaranteed that there is at least one person that is unhappy among his friends.
If Drazil can make all his friends become happy by this plan, print "Yes". Otherwise, print "No".
2 3
0
1 0
Yes
2 4
1 0
1 2
No
2 3
1 0
1 1
Yes
By 
we define the remainder of integer division of i by k.
In first sample case:
题目意思很简单，就是看，能否在最后使所有的人都快乐。
第一发错了，在用i的值进行遍历的时候，第二次直接让i <= 1000000，过了，所以 i 到底该取多大，我是不知道的。再想想
1 #include <iostream> 2 #include <cstdio> 3 #include <cstring> 4 #include <algorithm> 5 #include <queue> 6 #include <ctype.h> 7 #define mem(a, b) memset((a), (b), (sizeof(a))) 8 using namespace std; 9 const int max_size = 110; 10 11 int main() 12 { 13 int n, m; 14 int boy[max_size]; 15 int girl[max_size]; 16 mem(boy, 0); 17 mem(girl, 0); 18 int boy_num, b; 19 int girl_num, g; 20 cin >> n >> m; 21 cin >> boy_num; 22 for(int i = 0; i < boy_num; i++) 23 { 24 cin >> b; 25 boy[b] = 1; 26 } 27 cin >> girl_num; 28 for(int i = 0; i < girl_num; i++) 29 { 30 cin >> g; 31 girl[g] = 1; 32 } 33 34 for(int i = 0; i <= 1000000; i++) 35 { 36 b = i % n; 37 g = i % m; 38 if(boy[b]+girl[g]) 39 { 40 boy[b] = 1; 41 girl[g] = 1; 42 } 43 } 44 bool tag = true; 45 for(int i = 0; i < n; i++) 46 { 47 if(boy[i] == 0) 48 tag = false; 49 50 } 51 for(int i = 0; i < m; i++) 52 { 53 if(girl[i] == 0) 54 tag = false; 55 } 56 if(tag == false) 57 cout << "No" << endl; 58 else 59 cout << "Yes" << endl; 60 return 0; 61 }
CodeForces 515B. Drazil and His Happy Friends
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原文地址：http://www.cnblogs.com/ya-cpp/p/4354593.html
