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 2005mohamed 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--!