PAT1036:Boys vs Girls

1036. Boys vs Girls (25)

时间限制

400 ms

内存限制

65536 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female students.

Input Specification:

Each input file contains one test case. Each case contains a positive integer N, followed by N lines of student information. Each line contains a student's name, gender, ID and grade, separated by a space, where name and ID are strings of no more than 10 characters with no space, gender is either F (female) or M (male), and grade is an integer between 0 and 100. It is guaranteed that all the grades are distinct.

Output Specification:

For each test case, output in 3 lines. The first line gives the name and ID of the female student with the highest grade, and the second line gives that of the male student with the lowest grade. The third line gives the difference grade_F-grade_M. If one such kind of student is missing, output "Absent" in the corresponding line, and output "NA" in the third line instead.

Sample Input 1:

3
Joe M Math990112 89
Mike M CS991301 100
Mary F EE990830 95

Sample Output 1:

Mary EE990830
Joe Math990112
6

Sample Input 2:

1
Jean M AA980920 60

Sample Output 2:

Absent
Jean AA980920
NA

思路
很简单，判断每次输入的是男是女，再比较下之前保存的成绩，分别保留女生最高和男生最低的成绩，最后计算下差值即可。有任何一方为空则按题要求输出对应的错误处理即可。
代码

#include<iostream>
#include<vector>
#include<string>
using namespace std;

int main()
{
    int N;
    while(cin >> N)
    {
        vector<string> lowestmale(4);
        vector<string> highestfemale(4);
        string name,sex,subject,grade;
        for(int i = 0; i < N;i++)
        {
            cin >> name >> sex >> subject >> grade;
            if(sex == "M")
            {
               if(lowestmale[3] == "" || (lowestmale[3] != "" && stoi(lowestmale[3]) > stoi(grade)))
               {
                   //如果是第一次输入或者这一次输入的成绩比以往更低
                   lowestmale[0] = name;
                   lowestmale[1] = sex;
                   lowestmale[2] = subject;
                   lowestmale[3] = grade;
               }

            }
            else
            {
              if(highestfemale[3] == "" || (highestfemale[3] != "" && stoi(highestfemale[3]) < stoi(grade)))
               {
                   //如果是第一次输入或者这一次输入的成绩比以往更高
                   highestfemale[0] = name;
                   highestfemale[1] = sex;
                   highestfemale[2] = subject;
                   highestfemale[3] = grade;
               }
            }
        }
        if(highestfemale[0] != "")
           cout << highestfemale[0] << " " <<highestfemale[2] << endl;
        else
           cout << "Absent" << endl;

        if(lowestmale[0] != "")
           cout << lowestmale[0] << " " <<lowestmale[2] << endl;
        else
           cout << "Absent" << endl;

        if(lowestmale[0] != "" && highestfemale[0] != "")
           cout << stoi(highestfemale[3]) - stoi(lowestmale[3]) << endl;
        else
           cout << "NA" << endl;
    }
}