HUNNU--湖师大--11410--Eligibility
Regional Contest Director Osama Ismail knows that an individual cannot participate in the regional
contest more than 5 times. Given a list of contestant names and the previous years they participated
in, print which contestant is eligible.
Input Specification
The first line of the input contains a single integer T representing the number of the test cases
The first line of each test case contains a single integer N
N lines follow in this test case each having the format "Name Year" denoting that contestant Name
participated in a regional contest in year Year
T ≤ 100
0 ≤ N ≤ 500
Name is sequence of lowercase English letters, spaces and contains up to 20 characters
1970 ≤ Year ≤ 2070
Note that since he collected the data from multiple sources it may contain duplicate records (if a
contestant X have competed in year Y, you might find multiple lines "X Y" in the same test case)
Output Specification
For each test case, print a line containing the test case number as formatted in the sample and then
for each eligible contestant print his\her name on a single line and note that you must print the names
of the contestants in lexicographic order
Sample Input
1
6
ahmed 2010
ahmed 2011
ahmed 2009
ahmed 2008
ahmed 2005
mohamed 2001
Sample Output
Case #1:
mohamed
此题,水也,水题如何?比的就是方法,题意大概就是输入名字加上时间,每个人不许出现在不同的5个年份,排除之后还要字典序排序,亲们啊,听说名字和年份之间只有一个空格哦,听出我的意思了没?就是可能会有很多个空格,除了里年份最近的那个,其他都应该是名字的内容- -!
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
struct ssss //杠杠滴直接结构体搞起
{
char name[55]; //名字
int len; //名字这个字符串的总长度
}ss[555];
bool cmp(const ssss &a,const ssss &b) //字典序排序的小sort函数--!
{
if(strcmp(a.name,b.name)<0)return 1; //非递增
return 0;
}
int main (void)
{
int t,n,i,j,k,l,flog,m=1;
char s[55];
scanf("%d",&t);
while(t--&&scanf("%d%*c",&n))
{
for(i=0;i<n;i++)
gets(ss[i].name),ss[i].len=strlen(ss[i].name); //不知道名字尾端空格数,所以直接gets
sort(ss,ss+n,cmp); //排序时带上年龄直接排序,没影响
for(i=0;i<n;i++)ss[i].name[ss[i].len-5]='\0'; //打断,就是把字符串最后的年份切出来,这可是我的精华啊--!
cout<<"Case #"<<m++<<":"<<endl;
for(i=k=0;i<n;i++)
{
if(i==0){strcpy(s,ss[i].name),k=1;continue;} //第一次直接在s里面放进第一个名字,同时记录出现次数为1
if(!strcmp(ss[i].name,ss[i-1].name)) //如果名字相同
{
if(strcmp(ss[i].name+ss[i].len-4,ss[i-1].name+ss[i].len-4))k++; //如果年份不同就出现次数加一,先前是切断了,只是在名字最后面那个后面画上‘\0’,但是实际内存还是存在的,我只要能找到他的位置就可以再次利用他,就相当于年份被我变成了一个没有名字的静态字符串数组
}
else //名字不同
{
if(k<5)cout<<s<<endl; //如果没有出现5次以上就输出
strcpy(s,ss[i].name);k=1; //替换s,初始化k
}
}
if(k<5)cout<<s<<endl; //注意,最后那一个还是要考虑哦
}
return 0;
}
这里讲的就是对物理内存的运用的一个小技巧,文字永远比不上构图:s[111]
地址 1 2 3 4 5 6 7 8 9 10 11 12
内容 a h m e d 2 0 1 0 \0 \0 //6下面是空格,不是空
然后被我折腾之后:
地址 1 2 3 4 5 6 7 8 9 10 11 12
内容 a h m e d \0 2 0 1 0 \0 \0 //6下面变成空
这样我要比较名字就直接调用s就好了,因为函数的停止是碰到\0的时候,所以我对s的抄作只会到地址5,但是后面的年份我还是要用的,有什么办法?先前不是保存了总长度的么?s[6]==s[总长度-4]?虽然后面的年份不属于s了,但是我可以根据他们相对于s的位置找到他,完了,睡觉--!