The Beijing Institute of Technology re-examination machine --2016

1, input student information, names of scores (the number of results is not necessarily) the output of each student's school number and grade point average, and the number of courses over two failing students by failing several courses sorted in descending output.

input:

stu1

60 70 80 30

stu2

10 20 30 40 50

stu3

10 20 30 40 50 60 30

stu4

60 80 100

stu5

50 40 30 60 70

#

output:

stu1 60

stu2 30

stu3 34.2857

stu4 80

stu5 50

Failed several courses over two students are:

stu3 34.2857

stu2 30

stu5 50

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

struct student
{
    string name;
    vector<int> grade;
    int lownum = 0;
    double avgs;
};

bool cmp(student s1, student s2) {
    return s1.lownum > s2.lownum;
}

int main() {
    vector<student> v, vv;
    string s;
    cout << "Please enter student information: Name, enter # end result ...... " << endl;
     the while (cin >> S) {
         IF (S == " # " ) BREAK ; 
        Student STU; 
        stu.name = S;
         int Score, SUM = 0 , CNT = 0 ;
         the while (CIN >> Score) { 
            stu.grade.push_back (Score); 
            IF (Score < 60 ) stu.lownum ++ ; 
            SUM + = Score; 
            CNT ++ ;
             IF(getchar() == '\n') break;
        }
        stu.avgs = sum / (double)cnt;
        v.push_back(stu);
        if(stu.lownum > 2) vv.push_back(stu);
    }
    sort(vv.begin(), vv.end(), cmp);
    for(int i = 0; i < v.size(); i++) {
        cout << v[i].name << " " << v[i].avgs << endl;
    }
    cout << "不及格课程数超过2的学生有:" << endl;
    for(int i = 0; i < vv.size(); i++) {
        cout << vv[i].name << " " << vv[i].avgs << endl;
    }
    return 0;
}

2, the input string, the string comprises a digital output

input: 2.3ABC0-2.3

output:2.3 0 -2.3。

input: +004.500

output:4.5

(Originally output +4.5, but I feel that we should not need to '+', specific issues and problems right)

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

int main() {
    string s;
    while(cin >> s) {
        string str;
        vector<string> v;
        int dot;
        for(int i = 0; i < s.length(); i++) {
            if (s[i] == '+') continue;
            if (!isalpha(s[i])) str += s[i];
            if (isalpha(s[i]) || i == s.length() - 1 || s[i + 1] == '-') {
                if (str != "") {
                    if(str.length() != 1) {
                        int num = 0, num1, flag = 0, num2;
                        for(int j = 0; j < str.length(); j++) {
                            if(str[j] == '0') num++;
                            if(str[j] != '0' && !flag) {
                                flag++;
                                num1 = num;
                            }
                        }
                        num = 0;flag = 0;
                        for(int j = str.length() - 1; j >= 0; j--) {
                            if(str[j] == '0') num++;
                            if(str[j] != '0' && !flag) {
                                flag++;
                                num2 = num;
                            }
                        }
                        str = str.substr(num1, str.length() - num2 - num1);
                    }
                    v.push_back(str);
                    str = "";
                }
            }
        }
        for(int i = 0; i < v.size(); i++) {
            cout << v[i];
            if(i < v.size() - 1) cout << " ";
        }
        cout << endl;
    }
    return 0;
}

PS: The second question seems not perfect, and then taking the time to change it!

There are summer camps behind security research topics are also online, there is more time