c++程序runtime error ！help！

程序提交到oj上后一直runtime error

#include <iostream>
#include <string.h>
#include <algorithm>
using namespace std;
struct student 
{
  char g_num[12];
  int p_num;
  int score=0;
}stu[505];

int p[11];
bool comp(struct student a,struct student b)
{
    if(a.score==b.score) return strcmp(a.g_num,b.g_num);
    else return a.score>b.score;
}
int main()
{
  int T;
  cin>>T;
  for(int i=0;i<T;i++)
  {
      
      int N,M,G,sum=0;
      cin>>N>>M>>G;
      for(int j=1;j<=M;j++)
        {
          int a;
          cin>>a;
          p[j]=a;
        }
      for(int j=0;j<N;j++)
      {
        stu[j].score=0;
        scanf("%s %d",stu[j].g_num,&stu[j].p_num);
        for(int k=0;k<stu[j].p_num;k++)
        {
          int temp;
          cin>>temp;
          stu[j].score+=p[temp];
        }
        if(stu[j].score>=G) sum++;
        
      }
      
    sort(stu,stu+N,comp);
    printf("case #%d:\n",i);
    cout<<sum<<endl;
    for(int j=0;j<sum;j++)
    {
      printf("%s %d\n",stu[j].g_num,stu[j].score);
    }




  }
}

你代码运行时超时了,检查循环嵌套是不是太多

你的comp函数写得不对：

bool comp(struct student a,struct student b)
{
    if(a.score==b.score) return strcmp(a.g_num,b.g_num);
    else return a.score>b.score;
}

假设：

    a.score = 1;
    a.g_num = "12";
    b.score = 1;
    b.g_num = "23";

strcmp("12","23") = -1, strcmp("23","12")=1, 1和-1都是true。所以会出现：
comp(a,b) == true 同时 comp(b, a) == true, 矛盾。std::sort检查到这种情况，就认为你的comp函数是错误的，就抛出RunTime Error。
修改方法：

bool comp(struct student a, struct student b)
{
    if (a.score == b.score) 
        return strcmp(a.g_num, b.g_num) < 0;
    else 
        return a.score > b.score;
}