终于发现是char类型溢出了.
虽然改正后TLE,但终于知道为什么WA了

> 谁能教教我?
> 
> #include<iostream>
> using namespace std;
> 
> int main(){
>     unsigned int number;
>     while(cin>>number){
>     
>     char time[1000020];   //用于放间隔,如1 3存为time[1]不变,time[2]=time[3]=1;
>     char pop[1000020];   //用于存放点
>     memset(time, 0, 1000020*sizeof(char));
>     memset(pop, 0, 1000020*sizeof(char));
>     
>     unsigned int top=0;
>     while(number-->0){
>         unsigned int left,right;
>         cin>>left>>right;
>         if(right>top)
>             top=right;
>         if(left==right){
>             pop[left]++;    -->   pop[left]='1';
>             continue;
>         }
>         left++;
>         while(left<=right){
>             time[left]++;   -->  time[left]='1';
>             left++;
>         }
>     }
>     
>     int in=0;
>     for(number=0;number<=top+1;number++){
>         if(time[number]){
>             if(in==0){
>                 in=1;
>                 cout<<number-1<<" ";
>             }
>         }
>         else{
>             if(in){
>                 in=0;
>                 cout<<number-1<<endl;
>             }
>             if(pop[number] && !time[number+1]){
>                 cout<<number<<" "<<number<<endl;
>             }
>         }
>     }
>     }
> }