mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
#include<iostream>
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#include<vector>
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#include<algorithm>
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#include<cstdio>
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#include<string>
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#include<map>
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#include<set>
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#include<cstring>
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using namespace std;
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map<int,set<int> > m;
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map<int,set<int> >::iterator mi;
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set<int>::iterator si;
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set<int>s;
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map<int,int>yy;
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int n;
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int tx,ty;
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char c[11];
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int temp,t2;
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int tt;
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int main()
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{
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int cas=1;
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while(cin>>n)
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{
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if(n==0)
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{
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break;
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}
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if(cas!=1)
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{
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cout<<endl;
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}
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printf("Case %d:\n",cas++);
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m.clear();
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s.clear();
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yy.clear();
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for(int i=1;i<=n;i++)
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{
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scanf("%s",c);
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scanf("%d%d",&tx,&ty);
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if(c[0]=='a')
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{
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if(yy.find(ty) == yy.end())
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{
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yy[ty] = 1;
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}
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else
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{
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yy[ty]++;
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}
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if(s.find(tx)==s.end())
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{
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s.insert(tx);
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}
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mi = m.find(tx);
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if(mi != m.end())
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{
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si = mi -> second.find(ty);
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if(si!=mi -> second.end())
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{
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continue;
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}
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else
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{
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mi->second.insert(ty);
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}
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}
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else
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{
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m[tx].insert(ty);
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}
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}
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else if(c[0]=='f')
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{
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if(yy.upper_bound(ty) == yy.end())
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{
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printf("-1\n");
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continue;
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}
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tt = tx;
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while(true)
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{
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if(s.empty())
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{
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printf("-1\n");
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break;
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}
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si = s.upper_bound(tt);
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if(si!=s.end())
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{
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temp = *si;
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tt = temp;
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if(m[temp].empty())
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{
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continue;
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}
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si = m[temp].upper_bound(ty);
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if(si != m[temp].end())
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{
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t2 = *si;
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printf("%d %d\n",temp,t2);
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break;
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}
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else
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{
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continue;
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}
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}
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else
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{
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printf("-1\n");
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break;
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}
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}
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}
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else if(c[0]=='r')
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{
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m[tx].erase(ty);
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if(m[tx].empty())
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{
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s.erase(tx);
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}
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if(!--yy[ty])
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{
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yy.erase(ty);
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}
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}
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}
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}
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return 0;
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}
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