题目链接：

1 #include 
     
       2 #include 
      
        3 using namespace std; 4  5 int main() 6 { 7     int mark[201]; 8     int a, b; 9     int t;10     int n;11     while(scanf("%d", &t) != EOF)12     {13         for(int i = 0; i < t; i++)14         {15             memset(mark, 0, sizeof(mark));16             scanf("%d", &n);17             for(int j = 0; j < n; j++)18             {19                 scanf("%d %d", &a, &b);20                 if(a > b)21                 {22                     a = a - b;23                     b = a + b;24                     a = b - a;25                 }26                 a = (a + 1) / 2;27                 b = (b + 1) / 2;28                 for(int k = a; k <= b; k++)29                 {30                     mark[k]++;31                 }32             }33             int max = 0;34             for(int j = 1; j < 201; j++)35             {36                 if(mark[j] > max)37                 {38                     max = mark[j];39                 }40             }41             printf("%d\n", 10 * max);42         }43     }44     return 0;45 }