题目：https://pintia.cn/problem-sets/994805260223102976/problems/994805273284165632

一开始题目理解错了，有两个测试点一直没过，改了就OK了

代码

  1. #include<cstdio>
  2. #include<algorithm>
  3. #include<cmath>
  4. int main(){
  5.     int n, d;
  6.     double e, temp;
  7.     int sum1 = 0, sum2 = 0;
  8.     scanf("%d%lf%d", &n, &e, &d);
  9.     for(int i = 0; i < n; i++){
  10.         int day_num = 0, k;
  11.         scanf("%d", &k);
  12.         for(int j = 0; j < k; j++){
  13.             scanf("%lf", &temp);
  14.             if(temp < e) day_num++;
  15.         }
  16.         if(day_num > k / 2){
  17.             k > d ? sum1++ : sum2++;
  18.         } 
  19.     }
  20.     double sum1_res = (double) sum1 / n * 100;
  21.     double sum2_res = (double) sum2 / n * 100;
  22.     printf("%.1f%% %.1f%%", sum2_res, sum1_res);
  23. }