码迷,mamicode.com
首页 > 其他好文 > 详细

HDU4768:Flyer [ 二分的奇妙应用 好题 ]

时间:2015-02-12 19:54:18      阅读:272      评论:0      收藏:0      [点我收藏+]

标签:

传送门

Flyer

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 1718    Accepted Submission(s): 622


Problem Description
The new semester begins! Different kinds of student societies are all trying to advertise themselves, by giving flyers to the students for introducing the society. However, due to the fund shortage, the flyers of a society can only be distributed to a part of the students. There are too many, too many students in our university, labeled from 1 to 2^32. And there are totally N student societies, where the i-th society will deliver flyers to the students with label A_i, A_i+C_i,A_i+2*C_i,…A_i+k*C_i (A_i+k*C_i<=B_i, A_i+(k+1)*C_i>B_i). We call a student "unlucky" if he/she gets odd pieces of flyers. Unfortunately, not everyone is lucky. Yet, no worries; there is at most one student who is unlucky. Could you help us find out who the unfortunate dude (if any) is? So that we can comfort him by treating him to a big meal!
 

 

Input
There are multiple test cases. For each test case, the first line contains a number N (0 < N <= 20000) indicating the number of societies. Then for each of the following N lines, there are three non-negative integers A_i, B_i, C_i (smaller than 2^31, A_i <= B_i) as stated above. Your program should proceed to the end of the file.
 

 

Output
For each test case, if there is no unlucky student, print "DC Qiang is unhappy." (excluding the quotation mark), in a single line. Otherwise print two integers, i.e., the label of the unlucky student and the number of flyers he/she gets, in a single line.
 

 

Sample Input
2 1 10 1 2 10 1 4 5 20 7 6 14 3 5 9 1 7 21 12
 

 

Sample Output
1 1 8 1
 

 

Source
 

 

Recommend
liuyiding   |   We have carefully selected several similar problems for you:  5173 5170 5169 5168 5165 
 

 

题意及题解转自:http://blog.csdn.net/libin56842/article/details/25741317
题意:n个社团派发传单,有a,b,c三个参数,派发的规则是,派发给序号为a,a+c....a+k*c,序号要求是小于等于b
这其中,有一个学生只收到了奇数传单,要求找出这个学生的编号与得到的传单数目
 
思路:如果使用异或运算,也还是比较简单的,但是这样的话所花费的时间就比较长,正确的做法是使用二分
使用二分来划分区间,由于是每个社团得到的序列都是等差数列,所以我们很容易能得到区间派发的传单数
如果是奇数,那么所求的人肯定在左区间,否则在右区间,这样二分下去找到答案
 

 

12940329 2015-02-12 17:35:01 Accepted 4768 78MS 1756K 1933 B G++ czy

 

  1 #include<iostream>
  2 #include<cstring>
  3 #include<cstdlib>
  4 #include<cstdio>
  5 #include<algorithm>
  6 #include<cmath>
  7 #include<queue>
  8 #include<map>
  9 #include<set>
 10 #include<stack>
 11 #include<string>
 12 
 13 #define N 20005
 14 #define M 205
 15 #define mod 10000007
 16 //#define p 10000007
 17 #define mod2 1000000000
 18 #define ll long long
 19 #define LL long long
 20 #define eps 1e-6
 21 #define inf 100000000
 22 #define maxi(a,b) (a)>(b)? (a) : (b)
 23 #define mini(a,b) (a)<(b)? (a) : (b)
 24 
 25 using namespace std;
 26 
 27 int n;
 28 ll a[N],b[N],c[N];
 29 ll num[N];
 30 ll ans;
 31 ll ma;
 32 ll cc;
 33 
 34 void ini()
 35 {
 36     int i;
 37     ma=0;
 38     for(i=1;i<=n;i++){
 39         scanf("%I64d%I64d%I64d",&a[i],&b[i],&c[i]);
 40         ma=max(ma,b[i]);
 41         num[i]=(b[i]-a[i])/c[i]+1;
 42     }
 43 }
 44 
 45 ll ok(ll l,ll r)
 46 {
 47     int i;
 48     ll re;
 49     re=0;
 50     ll t1,t2;
 51     l--;
 52     for(i=1;i<=n;i++){
 53         if(l>b[i] || r<a[i]) continue;
 54         if(l<a[i]){
 55             t1=0;
 56         }
 57         else{
 58             t1=(l-a[i])/c[i]+1;
 59         }
 60         if(r>b[i]){
 61             t2=num[i];
 62         }
 63         else{
 64             t2=(r-a[i])/c[i]+1;
 65         }
 66         re+=t2-t1;
 67     }
 68     if(re%2==1) return re;
 69     else return 0;
 70 }
 71 
 72 void solve()
 73 {
 74     ll l,r,mid;
 75     l=0;r=ma;
 76     while(l<r)
 77     {
 78         mid=(l+r)/2;
 79         cc=ok(l,mid);
 80         if(cc!=0)
 81         {
 82             r=mid;
 83         }
 84         else{
 85             l=mid+1;
 86         }
 87     }
 88     ans=l;
 89     cc=ok(l,l);
 90 }
 91 
 92 void out()
 93 {
 94     if(cc==0){
 95         printf("DC Qiang is unhappy.\n");
 96     }
 97     else
 98         printf("%I64d %I64d\n",ans,cc);
 99 }
100 
101 int main()
102 {
103     //freopen("data.in","r",stdin);
104     //freopen("data.out","w",stdout);
105     //scanf("%d",&T);
106     //for(int ccnt=1;ccnt<=T;ccnt++)
107     //while(T--)
108     //scanf("%d%d",&n,&m);
109     while(scanf("%d",&n)!=EOF)
110     {
111         if(n==0) break;
112         ini();
113         solve();
114         out();
115     }
116     return 0;
117 }

 

HDU4768:Flyer [ 二分的奇妙应用 好题 ]

标签:

原文地址:http://www.cnblogs.com/njczy2010/p/4288612.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!