HDU1718 Rank【水题】

Rank

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 3980    Accepted Submission(s): 1539

Problem Description

Jackson wants to know his rank in the class. The professor has posted a list of student numbers and marks. Compute Jackson’s rank in class; that is, if he has the top mark(or is tied for the top mark) his rank is 1; if he has the second best mark(or is tied) his rank is 2, and so on.

Input

The input consist of several test cases. Each case begins with the student number of Jackson, an integer between 10000000 and 99999999. Following the student number are several lines, each containing a student number between 10000000 and 99999999 and a mark between 0 and 100. A line with a student number and mark of 0 terminates each test case. There are no more than 1000 students in the class, and each has a unique student number.

Output

For each test case, output a line giving Jackson’s rank in the class.

Sample Input

20070101

20070102 100

20070101 33

20070103 22

20070106 33

0 0

Sample Output

2

题目大意：第一行是Jackson的学号，之后是Jackson及班里同学的学号、分数。

问：Jackson在班里是第几。

思路：有一点会出错。假如有和Jackson分数一样的同学，Jackson的排名和他

们是并列排名，而不是字典序递增排名。

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
using namespace std;

struct Node
{
    int id;
    int score;
};

Node A[1100];

int cmp(Node a,Node b)
{
    if(a.score != b.score)
        return a.score > b.score;
    return a.id < b.id;
}

int main()
{
    int id;
    while(cin >> id)
    {
        int i = 0;
        memset(A,0,sizeof(A));
        while(cin >> A[i].id >> A[i].score)
        {
            if(A[i].id==0 && A[i].score==0)
                break;
            i++;
        }
        sort(A,A+i,cmp);
        //cout << i << endl;
        int rank = 0;
        for(int j = 0; j < i; j++)
            if(A[j].id == id)
            {
                int k = j-1;
                while(A[k].score == A[j].score && k >= 0)
                {
                    k--;
                    rank--;
                }
                cout << rank+1 << endl;
            }

            else
                rank++;
    }

    return 0;
}