#include <iostream> #include <stdio.h> #include <string.h> #define maxn 200 + 50 using namespace std; int num[maxn]; int main() { int t, n; int st,end; int x,y; scanf("%d",&t); while(t--) { memset(num,0,sizeof(num)); int maxtime = 0; scanf("%d",&n); for( int i = 0; i<n; i++) { scanf("%d %d",&st, & end); x = (st%2 == 1 ? st/2 +1 : st/2); y = (end%2 == 1 ? end/2 + 1: end/2); int temp = min(x,y); for( int j = temp; j<= x+y-temp; j++ ) { num[j] += 10; if(maxtime < num[j]) maxtime = num[j]; } } printf("%d\n",maxtime); } }