poj 2894 Ancient Keyboard

# include <iostream># include <cstring>using namespace std;int main(){    int test;    cin>>test;    while(test--)    {       int n;       cin>>n;       char l;       int s,e,c[1001],max=-1,min=0xfffffff;       memset(c,0,sizeof(c));       while(n--)       {          cin>>l>>s>>e;          for(int i=s;i<e;i++) c[i]++;          if(e>max) max=e;          if(s<min) min=s;       }       for(int i=min;i<=max;i++)          if(c[i]) cout<<(char)(c[i]+64);       cout<<endl;    }    return 0;}