(PAT 1137) Final Grading (排序)

喜欢ヅ旅行 2022-03-19 11:45 149阅读 0赞

1137 Final Grading （25 point(s)）

For a student taking the online course "Data Structures" on China University MOOC ([http://www.icourse163.org/][http_www.icourse163.org]), to be qualified for a certificate, he/she must first obtain no less than 200 points from the online programming assignments, and then receive a final grade no less than 60 out of 100. The final grade is calculated by G=(Gmid−term×40%+Gfinal×60%) if Gmid−term>Gfinal, or Gfinal will be taken as the final grade G. Here Gmid−term and Gfinal are the student's scores of the mid-term and the final exams, respectively.

The problem is that different exams have different grading sheets. Your job is to write a program to merge all the grading sheets into one.

### Input Specification: ###

Each input file contains one test case. For each case, the first line gives three positive integers: P , the number of students having done the online programming assignments; M, the number of students on the mid-term list; and N, the number of students on the final exam list. All the numbers are no more than 10,000.

Then three blocks follow. The first block contains P online programming scores Gp's; the second one contains M mid-term scores Gmid−term's; and the last one contains N final exam scores Gfinal's. Each score occupies a line with the format: `StudentID Score`, where `StudentID` is a string of no more than 20 English letters and digits, and `Score` is a nonnegative integer (the maximum score of the online programming is 900, and that of the mid-term and final exams is 100).

### Output Specification: ###

For each case, print the list of students who are qualified for certificates. Each student occupies a line with the format:

`StudentID` Gp Gmid−term Gfinal G

If some score does not exist, output "−1" instead. The output must be sorted in descending order of their final grades (G must be rounded up to an integer). If there is a tie, output in ascending order of their `StudentID`'s. It is guaranteed that the `StudentID`'s are all distinct, and there is at least one qullified student.

### Sample Input: ###

6 6 7
    01234 880
    a1903 199
    ydjh2 200
    wehu8 300
    dx86w 220
    missing 400
    ydhfu77 99
    wehu8 55
    ydjh2 98
    dx86w 88
    a1903 86
    01234 39
    ydhfu77 88
    a1903 66
    01234 58
    wehu8 84
    ydjh2 82
    missing 99
    dx86w 81

### Sample Output: ###

missing 400 -1 99 99
    ydjh2 200 98 82 88
    dx86w 220 88 81 84
    wehu8 300 55 84 84

解题思路:

感觉被这一题针对了,最后一个点死活过不去

利用map存储数据的时候,int初始值会赋为0,而这里会出现成绩为0的情况。。

所以一开始就要把期中成绩和期末成绩先赋值为-1

算总成绩时,如果其中成绩为-1,直接把最终成绩赋值为最终成绩

排除掉总成绩低于60的人,最后输出成绩

注意算总成绩时要+0.5,这样才会进位

#include <iostream>
    #include <algorithm>
    #include <unordered_map>
    #include <string>
    #include <string.h>
    using namespace std;
    const int MAXN = 10010;
    unordered_map<string, int> assscores,mid_term,final_term,final_grade;
    string namelist[MAXN],getNameList[MAXN];
    int N, M, P;
    
    bool cmp(string a, string b) {
    	if (final_grade[a] != final_grade[b]) return final_grade[a] > final_grade[b];
    	else {
    		return strcmp(a.c_str(), b.c_str()) < 0;
    	}
    }
    
    int main() {
    	int index = 0;
    	int gindex = 0;
    	cin >> N >> M >> P;
    	string name;
    	int score;
    	for (int i = 0; i < N; ++i) {
    		cin >> name >> score;
    		if(score < 200) continue;
    		assscores[name] = score;
    		mid_term[name] = final_term[name] = -1;
    		namelist[index++] = name;
    	}
    	for (int i = 0; i < M; ++i) {
    		cin >> name >> score;
    		if(!assscores[name]) continue;
    		mid_term[name] = score;
    	}
    	for (int i = 0; i < P; ++i) {
    		cin >> name >> score;
    		if(!assscores[name]) continue;
    		final_term[name] = score;
    	}
    	for (int i = 0; i < index; ++i) {
    		double finalGrade = 0;
    		if (mid_term[namelist[i]] == -1) {
    			finalGrade = final_term[namelist[i]];
    		}
    		else {
    			if (mid_term[namelist[i]] > final_term[namelist[i]]) {
    				finalGrade = mid_term[namelist[i]] * 0.4 + final_term[namelist[i]] * 0.6 + 0.5;
    			}
    			else {
    				finalGrade = final_term[namelist[i]];
    			}
    		}
    		if (finalGrade >= 60) {
    			final_grade[namelist[i]] = (int)finalGrade;
    			getNameList[gindex++] = namelist[i];
    		}
    	}
    	sort(getNameList, getNameList + gindex, cmp);
    	for (int i = 0; i < gindex; ++i) {
    		printf("%s %d %d %d %d\n", getNameList[i].c_str(), assscores[getNameList[i]], mid_term[getNameList[i]], final_term[getNameList[i]], final_grade[getNameList[i]]);
    	}
    	system("PAUSE");
    	return 0;
    }

[http_www.icourse163.org]: http://www.icourse163.org/