请问各位大佬，第一个为什么会WA

#include<iostream>
#include<cstring>
#include<sstream>
using namespace std;

class ID
{
    public:
        string message, name, Chinese, math, English;
        int pos1, pos2, pos3;
        int C, M, E, all;

        void Find()
        {
            pos1 = message.find(" ");
            pos2 = message.find(" ", pos1 + 1);
            pos3 = message.find(" ", pos2 + 1);

            name = message.substr(0, pos1);
            Chinese = message.substr(pos1 + 1, pos2 - pos1 - 1);
            math = message.substr(pos2 + 1, pos3 - pos2 - 1);
            English = message.substr(pos3 + 1, message.length() - pos3 - 1);

            istringstream ss(Chinese);
            ss >> C;
            istringstream ss1(math);
            ss1 >> M;
            istringstream ss2(English);
            ss2 >> E;

            all = C + M + E;
        }
};

int main()
{
    string Highest_Student;
    int max_all = -9999, max_C, max_M, max_E;

    freopen("P5740_1.in","r",stdin);  
    freopen("P5740_1.out","w",stdout);

    int N;
    cin >> N;

    cin.ignore(); 

    string input;

    ID student[N];

    for (int i = 0; i < N; i++)
    {
        getline(cin, student[i].message);
        student[i].Find();

        if (student[i].all > max_all)
        {
            Highest_Student = student[i].name;
            max_C = student[i].C;
            max_M = student[i].M;
            max_E = student[i].E;

            max_all = student[i].all;
        }
    } 

    cout << Highest_Student << " " << max_C << " " << max_M << " " << max_E;

    fclose(stdin);
    fclose(stdout);

    return 0; 
}