POJ 2153 Rank List（map）

题目链接：http://poj.org/problem?id=2153

Rank List
Time Limit: 10000MS Memory Limit: 65536K
Total Submissions: 10857 Accepted: 3654
Description

Li Ming is a good student. He always asks the teacher about his rank in his class after every exam, which makes the teacher very tired. So the teacher gives him the scores of all the student in his class and asked him to get his rank by himself. However, he has so many classmates, and he can’t know his rank easily. So he tends to you for help, can you help him?
Input

The first line of the input contains an integer N (1 <= N <= 10000), which represents the number of student in Li Ming’s class. Then come N lines. Each line contains a name, which has no more than 30 letters. These names represent all the students in Li Ming’s class and you can assume that the names are different from each other.

In (N+2)-th line, you’ll get an integer M (1 <= M <= 50), which represents the number of exams. The following M parts each represent an exam. Each exam has N lines. In each line, there is a positive integer S, which is no more then 100, and a name P, which must occur in the name list described above. It means that in this exam student P gains S scores. It’s confirmed that all the names in the name list will appear in an exam.
Output

The output contains M lines. In the i-th line, you should give the rank of Li Ming after the i-th exam. The rank is decided by the total scores. If Li Ming has the same score with others, he will always in front of others in the rank list.
Sample Input

3
Li Ming
A
B
2
49 Li Ming
49 A
48 B
80 A
85 B
83 Li Ming
Sample Output

1
2

【思路分析】先特殊记录李明的分数，然后再整个map中扫一遍，看比李明分数高的人有多少个。

【AC代码】

#include<cstdio>#include<cstring>#include<string>#include<iostream>#include<stack>#include<queue>#include<map>#include<algorithm>using namespace std;char str[25];int main(){    int n;    while(~scanf("%d",&n))    {        getchar();        if(n==0)        {            break;        }        map<string,int>m;        for(int i=0; i<n; i++)//每个名字初始化为1分        {            gets(str);            m[str]++;        }        int t;        scanf("%d",&t);        getchar();        int num,flag=1;//flag记录LIMING 的分数，一开始为什么是1可以想一下        for(int i=0; i<t; i++)        {            for(int i=0; i<n; i++)            {                scanf("%d",&num);                getchar();                memset(str,0,sizeof(str));                gets(str);                m[str]+=num;                if(strcmp(str,"Li Ming")==0)                {                    flag+=num;                }            }            int pp=1;            map<string,int>::iterator it;            for(it=m.begin();it!=m.end();++it)            {                if(it->second>flag)                {                    pp++;                }            }            printf("%d\n",pp);        }    }    return 0;}