1012 The Best Rank

To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C – C Programming Language, M – Mathematics (Calculus or Linear Algrbra), and E – English. At the mean time, we encourage students by emphasizing on their best ranks — that is, among the four ranks with respect to the three courses and the average grade, we print the best rank for each student.

For example, The grades of C, M, E and A – Average of 4 students are given as the following:

StudentID C M E A 310101 98 85 88 90 310102 70 95 88 84 310103 82 87 94 88 310104 91 91 91 91

Then the best ranks for all the students are No.1 since the 1st one has done the best in C Programming Language, while the 2nd one in Mathematics, the 3rd one in English, and the last one in average.

Input Specification:

Each input file contains one test case. Each case starts with a line containing 2 numbers N and M (≤2000), which are the total number of students, and the number of students who would check their ranks, respectively. Then N lines follow, each contains a student ID which is a string of 6 digits, followed by the three integer grades (in the range of [0, 100]) of that student in the order of C, M and E. Then there are M lines, each containing a student ID.

Output Specification:

For each of the M students, print in one line the best rank for him/her, and the symbol of the corresponding rank, separated by a space.

The priorities of the ranking methods are ordered as A > C > M > E. Hence if there are two or more ways for a student to obtain the same best rank, output the one with the highest priority.

If a student is not on the grading list, simply output N/A.

5 6

310101 98 85 88

310102 70 95 88

310103 82 87 94

310104 91 91 91

310105 85 90 90

310101

310102

310103

310104

310105

999999

Sample Output:

1 C

1 M

1 E

1 A

3 A

N/A

#include<iostream>
#include<algorithm>
#include<iomanip>
#include <ctype.h>
#include<string.h>
#include<string>
#include<cstring>
#include<stdio.h>
#include<math.h>
using namespace std;

struct student_inf {//优先ACME
    int StudentID=0;
    float C = 0;
    float M = 0;
    float E = 0;
    float A = 0;

};
bool exist[1000000] = { 0 };//判断学生是否存在
student_inf stu[2000];
int stu_ID[2000];
float a[2000];
float c[2000];
float m[2000];
float e[2000];//独立记录各课成绩
bool cmp(float a, float b) {
    return a > b;
}

int main() {
    int N;//学生数量
    int M;//排名的学生总数
    cin >> N >> M;

    for (int i = 0; i < N; i++) {
        cin >> stu[i].StudentID >> stu[i].C >> stu[i].M >> stu[i].E;
        c[i] = stu[i].C;
        m[i] = stu[i].M;
        e[i] = stu[i].E;
        a[i] = (c[i]+m[i]+e[i])/3;
        stu[i].A = a[i];
        exist[stu[i].StudentID] = 1;
    }
    for (int i = 0; i < M; i++) {
        cin >> stu_ID[i];
    }
    sort(a, a + N, cmp);
    sort(c, c + N, cmp);
    sort(m, m + N, cmp);
    sort(e, e + N, cmp);
    int rank[4] = {0};//记录每个学生ACME的rank
    char course[4] = { 'A','C','M','E' };
    for (int i = 0; i < M; i++) {//stu_ID
        if (exist[stu_ID[i]] == 1) {
            //存在
            float a_i = 0;
            float c_i = 0;
            float m_i = 0;
            float e_i = 0;
            for (int j = 0; j < N; j++) {
                if (stu[j].StudentID == stu_ID[i]) {
                    a_i = stu[j].A;
                    c_i = stu[j].C;
                    m_i = stu[j].M;
                    e_i = stu[j].E;
                }
            }
            //int index = 0;
            for (int j = 0; j < N; j++) {
                if (a_i == a[j]) {
                    rank[0] = j;
                    break;
                }
            }
            for (int j = 0; j < N; j++) {
                if (c_i == c[j]) {
                    rank[1] = j;
                    break;
                }
            }
            for (int j = 0; j < N; j++) {
                if (m_i == m[j]) {
                    rank[2] = j;
                    break;
                }
            }
            for (int j = 0; j < N; j++) {
                if (e_i == e[j]) {
                    rank[3] = j;
                    break;
                }
            }
            int max = 2001;
            int index = 0;
            for (int j = 0; j < 4; j++) {
                if (rank[j] < max) {
                    max = rank[j];
                    index = j;
                }
            }
            cout << (max + 1) << ' ' << course[index] << endl;
        }
        else cout << "N/A" << endl;
    }
}