#include<iostream> #include<stdio.h>#include<cstring>using namespace std;int
party[100][2],vis[100],p,s,e;int main(){ int t=1,i,j,k; while(cin>>p,p) { for(i=0;i<p;++i) { cin>>s>>e;
party[i][0]=8+(s-8)*2; //把一刻钟拆成两半
party[i][1]=8+(e-8)*2; } memset(vis,0,sizeof(v
